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I have a 93 Dodge 4x4 Cummings I have replaced rear wheel…

Customer Question
I have a 93...

I have a 93 Dodge 4x4 Cummings I have replaced rear wheel cylinders and shoes front pads and rotors as well as calipers and Brake hoses in the front master cylinder and brake booster also have been replaced. When the truck is not running my brake does not go down to the floor if I start the truck my brakes slowly goes down to the floor I pumped it and it goes hard and then goes back down again help!!!

Mechanic's Assistant: How old are the rotors? How many miles are on the car?

Everything is new

Mechanic's Assistant: Are you fixing your 9-3 yourself? What have you tried so far?

Yes I am repairing it myself

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

If I I am a mechanic myself but I just cannot figure this one out if I pinch the lines going to the front the pedal gets stiff when I release that it will go down again

Submitted: 22 days ago.Category: Dodge
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Answered in 34 minutes by:
4/3/2018
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago
roy
roy, import/domestic specialest
Category: Dodge
Satisfied Customers: 7,276
Experience: ASE master tech for 40 years
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hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

ok

you still have air in the system. you need to get a pressure bleeder to get the remaining air out of the system. vacuuming and having someone push the pedal is not enough to get the air out since it is so big and the lines are long.

you can rent a pressure bleeder at a parts store. you fill the master, put the cap from the pressure bleeder on it and then pressurize it with air at the cap. it will force all the air out. bleed one wheel at a time. it is the only way we can get them bled with all the trucks.

Roy

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Customer reply replied 22 days ago
I have one and did it. No luck.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

did you bench bleed the master before installing it??

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Customer reply replied 22 days ago
I recognized if I crimp the hoses going to the caliper the brake gets stiff. When I remove the clamps it the break goes down again.
Customer reply replied 22 days ago
I did.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

which caliper?

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Customer reply replied 22 days ago
Both front.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

If you remove one at a time does one still hold good or do they both fail

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Customer reply replied 22 days ago
Even tried one at a time.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

are they rebuilt or new calipers?? sounds like they are drawing air into the system form the piston seals.

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Customer reply replied 22 days ago
If I crimp just the left it holds, if I crimp just the right it holds. Just don't make sense. That's the reason why I replaced both side calipers.
Customer reply replied 22 days ago
Reman is the only thing available.
Customer reply replied 22 days ago
Not sure if I mentioned that if the truck is not running the peddle never goes down.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

yep, thats the way it is when it is not running and you have air. as soon as the booster works, the pedal drops.

the air is at the front calipers, no doubt about that.

brake hoses and lines good and tight, no leaks??

Roy

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Customer reply replied 22 days ago
Seams when it supplies vacume to the booster that's when the peddle sinks, you pump it and it gets hard then sinks again.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

thats air in the system.

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Customer reply replied 22 days ago
Rubber hoses brand new. No leaks
Customer reply replied 22 days ago
I have ran about a gallon of fluid through it already.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

the fact that it drops with the engine running and holding the pedal concerns me. that tells me it is loosing internal pressure and that comes from the master cylinder.

Roy

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Customer reply replied 22 days ago
When I get under the truck and someone applies the break you can see the calipers compress and release.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

they release while the pedal is held down???

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Customer reply replied 22 days ago
I replaced it with a new one, no luck and replaced it with a reman and same issue. I have one coming tomorrow that comes as a set. Master and break booster together. Someone had mentioned that the rod in the break booster is not adjusted right.
Customer reply replied 22 days ago
they do release. You can see it compressing then it releases right away
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

you should never have to touch that rod. if that was the issue you would still have a firm hard pedal but either low pedal or high pedal.

try it and see. it sounds like the master is bleeding off pressure internally.

Roy

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Customer reply replied 22 days ago
If I pinch the hoses just a little bit the peddle holds.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

ok

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Customer reply replied 22 days ago
I think the same way but every time i change it I have the same issue.
Why why when I crimp the hose it holds pressure?
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

it could be bleeding off through the calipers. the piston seals may be drawing air into the caliper when applying. you stop that process by clamping them off.

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Customer reply replied 22 days ago
The original calipers did it. The new calipers (went through 2 sets) did it.
Customer reply replied 22 days ago
One thing I did notice when I replaced the pads in the front the outside pad was worn out to the bottom and the inside pad was still brand new.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

that is from the caliper mounts and slides. the outer should be away from the rotor just as the inner.

can you post a picture of the caliper mounts and caliper on this post??

I have to put a child to bed. be back in about 15-20 minutes

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Customer reply replied 22 days ago
Ok no problem, I understand.
I will get the photos
Customer reply replied 22 days ago
By the way my bleeders from the calipers are at the top.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

good, thats where they belong

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Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

does the caliper move freely along the mount???

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Customer reply replied 22 days ago
It does not. I know what you mean. This one seams to be stationed in one place.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

if you press back the piston, the caliper should slide back and forth

Roy

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Customer reply replied 22 days ago
It does not. The way it mounts is really weird
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

I know, you have the wedge and the attaching bolt. did you wire brush off all the rust and put lube on the areas it moves?

Roy

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Customer reply replied 22 days ago
I did not brush and lube it. Looked clean to the eye.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

clean them up real good and lube them up

Roy

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Customer reply replied 22 days ago
Ok, is there a way to let you know tomorrow once I try it?
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

sure, I will be on tomorrow morning until around 1 pm EST. then back on after 7 at night

Please take a moment and rate my service 3 stars or better. that is the only way the site will pay me for my efforts.

Roy

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Customer reply replied 22 days ago
Do I have to repay since this is still trying to be resolved? Not sure how this works.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

nope, once you rate it stays open and locked to me and we can continue s long as you wish.

Roy

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Customer reply replied 22 days ago
Ok so I get off tomorrow at 5pm. Its now 9pm here. (Not sure if you are in a different time zone). I will work on it tomorrow before I head to the shop/work.
I rate it tomorrow after we finish?
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

midnight here

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Customer reply replied 22 days ago
Ok.
So I will grease the calipers or should I replace the brake booster master cylinder combo, it Wil be here tomorrow.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

do the calipers first

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Customer reply replied 22 days ago
Ok
Customer reply replied 22 days ago
Do I rate tomorrow after I get back to you?
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

up to you. you can do it now or tomorrow.

Roy

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Customer reply replied 22 days ago
Ok I will get everything done before I head to the shop. I have it here at home in my personal garage. Thanks and I will talk with you again tomorrow.
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

sounds like a plan

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Customer reply replied 22 days ago
Thanks goodnight
Dodge Mechanic: roy, import/domestic specialest replied 22 days ago

good nght

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Customer reply replied 21 days ago
Sorry so late. My son had a baseball game after school.
No luck cleaning them, greasing it or with new parts.
Dodge Mechanic: roy, import/domestic specialest replied 20 days ago

I am going to open this up to other guys and see if they have any other ideas.

Roy

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Customer reply replied 20 days ago
Ok. It feels like it doesn't have enough pressure for the front calipers
Dodge Mechanic: roy, import/domestic specialest replied 20 days ago

no, when you block them off it has sufficient pressure. you have issue at both front wheels.

Roy

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Customer reply replied 20 days ago
I was wondering maybe when the master cylinder shaft travels more it bleeds . Because when I block it is not traveling
Dodge Mechanic: roy, import/domestic specialest replied 20 days ago

no, not the case.

your issue is at the front wheels

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Customer reply replied 20 days ago
I know when I slightly blocked the front caliper left a right the pedal seems not to sink
Dodge Mechanic: roy, import/domestic specialest replied 20 days ago

I know. you mentioned that a couple of times and I told you about the calipers could be sucking air.

Roy

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Customer reply replied 20 days ago
what I do I bled last night and there's no air coming out of them
Dodge Mechanic: roy, import/domestic specialest replied 16 days ago

I got a note from customer service that you still wanted help. I had opted out but I guess no one picked it up.

when you push on the pedal, can you see the brake hoses swell??

Roy

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Customer reply replied 16 days ago
No but I have replaced the hoses to
Dodge Mechanic: roy, import/domestic specialest replied 16 days ago

the fact you clamp them off and you have a good pedal says your issue is at those front wheels. I think you need to start over with the calipers and hoses. use new calipers not rebuilt.

Roy

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Customer reply replied 16 days ago
I don't know any company that makes brand new calipers
Dodge Mechanic: roy, import/domestic specialest replied 16 days ago

what brand did you get and the part numbers??

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Customer reply replied 16 days ago
From oreilly A1 Cardone
Dodge Mechanic: roy, import/domestic specialest replied 16 days ago

what series is your truck??

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Customer reply replied 16 days ago
What do you mean about series
Dodge Mechanic: roy, import/domestic specialest replied 16 days ago

1500, 2500, 3500??

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Customer reply replied 16 days ago
W250
Dodge Mechanic: roy, import/domestic specialest replied 16 days ago

ok let me check

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Customer reply replied 16 days ago
Ok
Dodge Mechanic: roy, import/domestic specialest replied 15 days ago

you are correct. no new calipers at all. too old. even the dealer has discontinued part numbers.

I would return the calipers for another pair under warranty.

Roy

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Customer reply replied 15 days ago
Already did and then it makes no difference
Dodge Mechanic: roy, import/domestic specialest replied 15 days ago

without being there, I am out of ideas. need to see it and touch it but cannot. I will open this up to the other guys to see if they have any ideas.

Roy

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Customer reply replied 15 days ago
Okay let me know
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roy
roy, import/domestic specialest
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