Car

Ask a Mechanic Online and Get Answers to Your Car Questions

Ask an Expert,
Get an Answer ASAP!

Car
This answer was rated:

Hello!I have a 1975 Lincoln Continental Town Coupe 460

Hello! I have a 1975...

Hello! I have a 1975 Lincoln Continental Town Coupe 460 cui. I have a problem with brakes. It started with low steering pump fluid (leaky steering gear) but when I added fluid brakes started to make problems. Pedal woul just slowly go to the bottom when depressed and brakes wouldn't work. Only if i press the pedal quickly I get the pressure and the car brakes. So, sometimes it works, sometimes the pedal goes to the bottom... Is it the master brake cylinder?

Show More
Show Less
Ask Your Own Car Question
Answered in 42 minutes by:
11/19/2012
The Audi Doctor
The Audi Doctor, Technician
Category: Car
Satisfied Customers: 2,429
Experience: Over 30 years experience, 17 years with Audi, Factory trained
Verified
Hello,

Thank You for choosing Just Answer and Pearl.com for your query. Yes, I can help you.

Yes, I believe you are “spot on” with your diagnosis. The Brake Master Cylinder is likely failed. This is a “classic symptom that I have been dealing with since I started working on cars back in 1974. The correlation between the two, steering fluid and sinking brake pedal, is unlikely however.

What happens is that over time the rubber plunger cup seals in the master cylinder harden over time. This allows the fluid to bypass the seal under light applications and seal under “quick” pressure.

A cup seal in a master cylinder works like this; When you press on the brake pedal the cup slides down the bore of the MC with the inside of the cup pressurizing and displacing the fluid. The fluid in turn goes down the brake lines and pushes the fluid down the lines and pushes the caliper pistons out to squeeze the brake discs, and pushes the wheel cylinders out to apply the rear brake shoes.

What has happened in the case of your Town Coupe is that when you apply the brakes gently the brake fluid bypasses the cup seal, but when you “stab” the brake pedal the pressure on the inside of the cup seal forces the walls of the cup seal to seal against the bore of the MC and the brakes appear to function as they should.

I suggest you have the master cylinder replaced as soon as possible. When safety is a concern I always have to recommend that you tow the vehicle if it must be moved prior to repair. You never know when it will “give up the ghost”.

I hope I have answered your questions and addressed your concerns. Should you have further questions on this matter, please do not hesitate to ask. I want you to be 100% satisfied with my answer.

Positive feedback, referrals and bonuses are always APPRECIATED. Please rate my answer as OK, GOOD, or EXCELLENT. With a lower rating I will not be compensated. Please contact me with your concerns if you cannot rate my answer OK, GOOD or EXCELLENT.

Thank You!
Jake “The Auto Doctor”
Ask Your Own Car Question
Customer reply replied 5 years ago

So, when replacing the master cylinder... is it the standard bleeding prescedure afterwards or is there some special Lincoln procedure since it is obviously a not-standard pressure system that connects steering gear and brakes to the steering pump (Hydro boost)?

The standard bleeding procedure applies. The Hydro Boost is connected, but the systems are separate. From the master cylinder on out, it is a standard system.

The Hydro Boost is a power assist that uses pressure from the power steering pump rather than vacuum from the engine to assist the brake pressure as in a vehicle with a vacuum booster.

Let me know if you have any more questions.

Please rate my answer as OK, GOOD, or EXCELLENT. With a lower rating I will not be compensated. Please contact me with your concerns if you cannot rate my answer OK, GOOD or EXCELLENT.

Thank You!
Jake “The Auto Doctor”
The Audi Doctor
The Audi Doctor, Technician
Category: Car
Satisfied Customers: 2,429
Experience: Over 30 years experience, 17 years with Audi, Factory trained
Verified
The Audi Doctor and 87 other Car Specialists are ready to help you
Ask your own question now
Ask The Audi Doctor Your Own Question
The Audi Doctor
The Audi Doctor
The Audi Doctor, Technician
Category: Car
Satisfied Customers: 2,429
2,429 Satisfied Customers
Experience: Over 30 years experience, 17 years with Audi, Factory trained

The Audi Doctor 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:

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

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time!

Paul MCorpus Christi, TX

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Technician

1,212 satisfied customers

16 years of experience

Ted G.

Ted G.

ASE Certified Technician

1,708 satisfied customers

20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

George H.

George H.

ASE Certified Technician

1,522 satisfied customers

ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

GM Tech (Cam)

GM Tech (Cam)

Auto Service Tech

669 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Amedee

Amedee

Former ASE Master Tech

2,505 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Jerry

Jerry

Master Mechanic

2,181 satisfied customers

ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager

Richard

Richard

ASE Certified Technician

1,000 satisfied customers

12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes

< Previous | Next >

Related Car Questions
P0700 code. P0700 and yes i reset it a number of times. 2006
the shifter interlock solnoid with either not work at all or click every time you touch the brake.… read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
909 satisfied customers
I'm working on my 2004 jeep grand Cherokee, it has the
hi, I'm working on my 2004 jeep grand Cherokee, it has the inline 6 cylinder 4.0litre engine. it runs rough after about 65 miles of driving. I scanned it has the following active fault codes: p0300, p… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,943 satisfied customers
I live in highlands nj isthere a mechanic near by who i can
chris i live in highlands nj isthere a mechanic near by who i can trust my 2006 bentley gt with … read more
Mechanic01
Mechanic01
1,164 satisfied customers
None of the 3 "cigarette lighter" outlets work in my 2006
None of the 3 "cigarette lighter" outlets work in my 2006 Sienna. Is it a relay? Or what? (Fuses are ok, everything else is working.) Thanks,… read more
camerontech
camerontech
20 year experience diagnostic technician
class a
550 satisfied customers
I left my parking lights on last night and completely killed
Hi, I left my parking lights on last night and completely killed the battery … read more
Todd M
Todd M
Owner
ASE Certification
1,299 satisfied customers
P0700 code. P0700 and yes i reset it a number of times. 2006
What is the model/year of your Chevy?Customer: 2006 cobalt ls 2.2… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,943 satisfied customers
1997 j30 alarm sounding, i do not have a key fob, we put the
1997 j30 alarm sounding, i do not have a key fob, we put the key in the ignition and turned it, of course does not start, but alarm did not go off either. This was several hours ago, we decided to dis… read more
Todd M
Todd M
Owner
ASE Certification
1,299 satisfied customers
I have a 2012 escape and the blower motor only works on
Hi. I have a 2012 escape and the blower motor only works on high. It used to work on all the settings but they intermittently fell off and stopped working. Any idea what needs to be replaced? This hap… read more
eurotec
eurotec
Vice President / Manager
Associate Degree
11 satisfied customers
I hear a rattling noise on the drivers side dashboard when I
I hear a rattling noise on the drivers side dashboard when I hit 50. it sounds like somethings loose or bouncing around under there like a little pebble. Any thoughts?… read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
192 satisfied customers
I have an 08 Scion tC, the code came out po137, changed 02
I have an 08 Scion tC, the code came out po137, changed 02 sensor still showing code, checked ignition coil, sill the same code, checked for air leaks couldn't find one unless I missed something, the … read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
I need front brake drums for my 1950 Nash Statesman. Is
I need front brake drums for my 1950 Nash Statesman . Is there another Make / Model that would work on my car ? Or do I have to get them relined ? … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Just changed my CV axle and wheel bearing in rear driver
Just changed my CV axle and wheel bearing in rear driver side of my 2008 Ford Explorer ABS light is now on along with flashing RSC in red any suggestions of what I need to do… read more
ggrote1
ggrote1
Vocational, Technical or Trade Scho
13 satisfied customers
Land rover discovery 2000 rear brake lights stay on while
land rover discovery 2000 rear brake lights stay on while car is running and left turn signal not working. Just had service done on car for new master cylynder and brake booster parts from centrix … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,913 satisfied customers
Fuel gauge reads empty when full and goes to full when
Fuel gauge reads empty when full and goes to full when empty. Assuming it is sending unit but not sure why it would work backwards. 2002 clk430 cabriolrt … read more
vwtech0405
vwtech0405
VW Technician
Associate Degree
8,868 satisfied customers
I have a 2013 Dodge Dart GT with a 6-speed manual
Second opinion] Hi, I have a 2013 Dodge Dart GT with a 6-speed manual transmission and the 2.4 liter engine. It came with 18-Inch x 7.5-Inch Hyper Black Aluminum rims and 225-40R18-92h XL--All Season … read more
Shawn Few
Shawn Few
AS
64 satisfied customers
My 407 HDI from time to time i cutting off fuel without any
Second opinion] My 407 HDI from time to time i cutting off fuel without any reson (engine off).… read more
Matt
Matt
Engineer
Bachelor\u0027s Degree
5 satisfied customers
I am an elderly woman whose hubby is totally disabled and in
I am an elderly woman whose hubby is totally disabled and in a home and I need the driver's door interior power door handle (Plastic) replaced as it broke off completely yesterday and unable to use th… read more
ggrote1
ggrote1
Vocational, Technical or Trade Scho
13 satisfied customers
I have a 2002 S2000 and my daughter has a 2004 Pilot. Both
I have a 2002 S2000 and my daughter has a 2004 Pilot. Both have check engine lights on. Both have nbeen taken to Honda dealerships having spark plugs and fuel filler assemblies replaced with no luck i… read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
192 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