2nd Gen Non-Engine/Transmission brake issues?

[pdxkid]

I recently had new calipers, drums, wheel cylinders and shoes installed. When I sit at a long stop, the pedal very slowly depresses more and more as I sit there. It does not go all the way to the floor but probably travels about 1/2-3/4".

Took it back to "my buddy the mechanic" and he couldn't get it to do that while he drove it (of course), looked it over, said there were no leaks and no air in the system, then I believe he put a new sensor or something of the like in the vacuum system just for good measure.

And it still does it.



A little bit less often ( it doesn't happen at every stop) and when the pedal does depress, it doesn't seem to have quite as much travel. "My buddy the mechanic" tells me he wants some of that crack I'm smokin', 'cause he just can't get it to act up when he drives it. This did not occur before the new brake job .

The brakes seem to work as good as they can for this year of truck, but it's getting kind of annoying and I'm starting to lose faith in "my buddy the mechanic" Any ideas?

 

[ata]

Your Master Clyinder is leaking between the front and rear pistons. (cylinders) Just because it does not do it all the time does not mean it's not going to start too! One of these days you will be sitting on a hill and the pedal will go all the way to the floor and the truck will start to roll and you will have to pump the pedal real fast to get it to stop.

 

[PBJ2500CTD]

I second what ata said. The master cylinder piston/plunger seals will often will get damaged or cease to seal properly after major work and bleeding of the system. During a "manual" bleeding of the system (pumping of the brake pedal) the plunger will exceed the "normal" travel and ride over a rough, unused part of the cylinder bore causing damage or contamination of the seal. This will cause a by-pass condition and your symptoms.

 

[Bob Cochran]

Your Master Clyinder is leaking between the front and rear pistons. (cylinders) Just because it does not do it all the time does not mean it's not going to start too! One of these days you will be sitting on a hill and the pedal will go all the way to the floor and the truck will start to roll and you will have to pump the pedal real fast to get it to stop.

Yep this is the problem have not had it on my truck but other vehicles in the past. Will get worse and worse tell it will bleed clear to floor when sitting.

 

[pdxkid]

thanks for the quick answers guys, I'll certainly explore this. what is the recommended fix? Is the seal replaceable? easily? and cheaply? thanks again.

 

[PBJ2500CTD]

Today I would go the way of installing a rebuilt unit due to the unknown variables like - is the bore corroded/pitted to the degree a honing will not clear it up, or is the wear in the bore beyond limits for a good seal. Also, finding a rebuild kit isn't as easy as it was years ago.

 

[Bob Cochran]

I have never tried to rebuild one have always purchased new/rebuilt. Can you even get rebuild kits for them I don't know.

 

[pdxkid]

Does anyone have the part number for the brake master cylinder, or know how to get it?

Thanks

 

[PBJ2500CTD]

try this website to download a parts manual for your specific model year. You do have to set up an account.

Mopar Parts for Dodge, Chrysler and Jeep: MoparPartsAmerica

 

[pdxkid]

reman. master cylinder on the way for $56. 99... ... .

 

[Joe Mc]

Same thing happened on mine few years back - I replaced the M-cyl w/reman unit - S'all gud.

 

[pdxkid]

Thanks TDR!

Got the truck back, brakes feel much better now after reman. master cyl.

Thank you members of tdr.

 

[JMcCoy]

Awesome success story.

 

[Bob Cochran]

Love it when a plan comes together!!!!