Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford
This answer was rated:

have very little brake pedal pressure after replacing the master

cylinder and front disc brake...
have very little brake pedal pressure after replacing the master cylinder and front disc brake calipers; pressure to rear brake cylinders is good (checked by pluging the output port to the front calipers at the master cylinder? builds some pedal pressure with engine off but once engine is craked i lose all pedal pressure? this
is a 1994 ford f150 pickup.
Show More
Show Less
Ask Your Own Ford Question
Answered in 2 minutes by:
6/15/2009
john -aka eauto
john -aka eauto, The Car Guy
Category: Ford
Satisfied Customers: 16,555
Experience: ase tech over 15 years in the field
Verified
are the rear brakes adjusted properly? I would pull the rear drums make sure the wheel cylinders are not seized and adjust the rear brakes. Usually when the pedal is soft after front brake repair its due to out of adjustment or bad rear wheel cylinders
Ask Your Own Ford Question
Customer reply replied 8 years ago

john, i don't think the rear brakes are the primary problem. the brakes were functioning

prior to replacing the master cylinder. i checked them and replaced the front pads and rear shoes about two months ago. i decided to replace the master cylinder and front calipers because the pedal pressue was slowly leaking down after applying pressure to the brake pedal.

have you looked at the rear brakes?
Ask Your Own Ford Question
Customer reply replied 8 years ago
john, if the pressue to the rear brakes builds and holds ok with the port to the front brakes on the master cylinder plugged would this not indicate that the rear brakes are ok?
Customer reply replied 8 years ago
Relist: I prefer a second opinion.
KEN
KEN, ASE Certified Technician
Category: Ford
Satisfied Customers: 27
Experience: ASE Certified Master Truck tech. 13+ years exp.
Verified

Hi Frank,

 

I agree that plugging the port for the rear brake line at the master cylinder should eliminate the rear brakes as being part of the problem.

 

If I understand correctly, the brake pedal was going down gradually when the vehicle was stopped and in gear before you replaced the master cylinder and front calipers and now you have the same problem only it is worse.

 

Bleeding the brakes is critical and can be deceptively difficult. I've attached the proscribed procedure for your truck. It is pretty straight forward, but you must be absolutely certain there is no air left in the system. You may have to refill the master cylinder a couple of times before you get all the air out. When you stop seeing air come out of the bleeder, bleed it again through at least four pedal strokes.

 

I also agree that the adjustment on the rear brakes is most often a contributing factor. Plugging the line at the master cylinder prevents the rear brakes from contributing to the problem to a degree, but does not insure that they are properly adjusted nor does it guarantee that the problem is only in the front.

 

I hope this helps,

 

Ken

 

NOTE: Bleed primary and secondary hydraulic brake systems separately, bleeding longest line first on each system. Do not allow reservoir to run dry during bleeding operation. Never reuse fluid that has been drained from hydraulic system.

  1. Loosen master cylinder to hydraulic line nuts and wrap shop cloths around tubing below fitting to absorb escaping brake fluid.
  2. Depress brake pedal slowly forcing air trapped in master cylinder out at fitting.
  3. Hold pedal down and tighten fittings, then release brake pedal. NOTE: Releasing brake pedal before fittings are tightened will allow air to enter the master cylinder.
  4. Repeat steps 1 through 3 until air ceases to escape at fittings and brake pedal is firm.
  5. Bleed brakes as follows: RR, LR, ABS valve, RF, LF
    1. Pump pedal several times, then hold pedal down firmly.
    2. With pedal firmly depressed, open bleeder screw on one rear brake until pedal fades, then close bleeder valve.
    3. Repeat procedure until a continuous flow of brake fluid is released from bleeder valve.
    4. Repeat steps 5a through 5c on other rear brake.
  1. Bleed the Rear Antilock Brake System (RABS) valve.
  2. Bleed the front brakes using same procedure as for rear brakes.
  3. Check brake operation and ensure pedal is firm, road test vehicle.
KEN
KEN, ASE Certified Technician
Category: Ford
Satisfied Customers: 27
Experience: ASE Certified Master Truck tech. 13+ years exp.
Verified
KEN and 87 other Ford Specialists are ready to help you
Ask your own question now
Customer reply replied 8 years ago

KEN, I HAVE DONE ALL THE THINGS THAT YOU SUGGESTED AND I STILL HAVE THE SAME PROBLEM (VERY LITTLE BRAKE PEDAL PRESSURE, ESPECIALLY WITH ENGINE CRANKED)? COULD THE PROBLEM BE WITH THE POWER BOOSTER? I CHECKED THE VACCUM PRESSURE AT THE BOOSTER AND IT SEEMS TO BE VERY GOOD. I HAVE NOTICED THAT WHEN DRIVING THE VEHICLE THERE SEEMS TO BE SOMEWHAT BETTER PEDAL PRESSUR WHEN THE ENGINE IS REVED UP FAIRLT HIGH.

I think I may have miss understood the problem. I'm not sure I understand what you mean by brake pedal pressure.

 

Do you mean that the amount of pressure you must exert on the brake pedal to make the truck stop is excessive? That would indicate a problem with the power booster, especially if it improves with higher engine RPMs.

 

Or by brake pedal pressure, do you mean that the pedal still gradually goes to the floor when you step on it and the brakes don't hold?

Ask Your Own Ford Question
Ask KEN Your Own Question
KEN
KEN
KEN, ASE Certified Technician
Category: Ford
Satisfied Customers: 27
27 Satisfied Customers
Experience: ASE Certified Master Truck tech. 13+ years exp.

KEN is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,155 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

27,937 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,335 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
2003 ford excursion no brake lights (third brake light out
2003 ford excursion no brake lights (third brake light out too) turn signals or hazzards … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
Recently car's response to braking results in weird feeling
recently car's response to braking results in weird feeling in pedal, nothing like I have felt before. Right off I thought it was master cylinder. But the brakes actually work. … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,927 satisfied customers
2003 Ford Windstar brake lights will come for a millisecond
2003 Ford Windstar brake lights will come for a millisecond when brake pedal is pressed. New brake switch put on and nothing changed. Found a used REM and changed it but have the same problem still. D… read more
Mechanic01
Mechanic01
1,141 satisfied customers
Drive a 2006 Ford F150 and the brake chime is on all the
Drive a 2006 Ford F150 and the brake chime is on all the time. It will chime about 5 times and then stop. If you have to apply the brakes it comes on again. … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
27,937 satisfied customers
Brake failure on my 2001 ford focus. There are no signs of
brake failure on my 2001 ford focus. There are no signs of fluid leakage. There is a hissing noise under the dash when the brakes are applied. There is some brake but not enough to drive safely. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I have the same problem with the brake pedal that's posted,
I have the same problem with the brake pedal that's posted … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,927 satisfied customers
Wlhen applying brakes Brake pedal initially hard to
Wlhen applying brakes Brake pedal initially hard to push...once it lets go then pedal goes down by itself to apply brakes....then to release must put toe under brake pedal to pull upwards. Then it is … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,335 satisfied customers
I accidentally poured water into the brake fluid reservoir,
Hi, I accidentally poured water into the brake fluid reservoir, in my 2014 Fusion. … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
27,937 satisfied customers
Is there anyway to bleed the brakes in a 2003 Mercury Grand
Is there anyway to bleed the brakes in a 2003 Mercury Grand Marquis without taking it to the dealer? The book says you must take it to the dealer to put a break out box on it. Can you tell me what tha… read more
Todd M
Todd M
Owner
ASE Certification
1,286 satisfied customers
2000 F150 LARIAT LOW BRAKE PEDAL. BY MYSELF NEW FRONT BRAKE
OLD ROTORS 200.000 PLUS BRAKE PEDAL USEDTO GO DOWN FAR UNTIL THE TRUCK WAS STARTED AND PUT INTO GEAR AT WHICH TIME THE PEDAL WOULD COME UP AND BE STRONG NOW IT DOES NOT COME UP LIKE IT USED TO STAYS LOW … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,335 satisfied customers
I've replaced everything within the brake system except for
I've replaced everything within the brake system except for the lines but there is no leaking and I have bleed the brakes and master over and over agen and the brakes work good the tires will lock up … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
Replaced rear calibers and now spongy brakes when engine is
Replaced rear calibers and now spongy brakes when engine is operating, hard brake pedal when engine is off. The web site indicates replacing ABS is the solution to the problem. What are your thoughts?… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
On a 2013 Ford Edge 3.5l engine, the brake pedal is heavy
Hello, on a 2013 Ford Edge 3.5l engine, the brake pedal is heavy and making a whistle noise when pressed. I know that is something wrong with the vacuum assistance and I just came to find out that thi… read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,335 satisfied customers
My brake lights come on when I brake, but they do not come
My brake lights come on when I brake, but they do not come on when my headlights are on. … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Brake light on, abs light on, no cruise, no cold air, Brake
Brake light on, abs light on, no cruise, no cold air … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
03 crown victoria no brake light, No brake light. I checked
I checked the fuse #19 and the brake safety switch … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,335 satisfied customers
94 F250. Vacuum power brakes I cannot get a good brake
94 F250. Vacuum power brakes I cannot get a good brake pedal. This has been an on going problem, and the customer wants it fixed. I have bled the brakes including putting a hose into a clear bottle an… read more
Eric
Eric
Auto Technician
589 satisfied customers
2013 Ford edge how to replace brake booster brake pedal is
2013 Ford edge how to replace brake booster brake pedal is hard and I think I hear air when I step on the pedal… read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,888 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x