1993 grand cheroke 4wd brake problems

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Jan 5, 2012 | 08:53 PM

jkent0425

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Newbie

Joined: Jan 2012

Posts: 1

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Model: Cherokee

1993 grand cheroke 4wd brake problems

have a 93 grand cherokee laredo 4wd 4.0. changed front brake pads, rotors, calipers and master cylinder. Bled brakes in proper order. Pedal still goes all the way to the floor and will not build pressure unless car is off. My 4wd went out same time my brakes did. Could this be related to my brake pressure problem? What to do? Help!

Last edited by jkent0425; Jan 5, 2012 at 08:57 PM.

Jan 5, 2012 | 11:48 PM

94zjdriver

Member

Joined: Oct 2011

Posts: 189

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From: Indianapolis Indiana

Year: 1994

Model: Grand Cherokee

Engine: 5.2

Looked this up in my repair manual

PEDAL FALLS AWAY
A brake pedal that falls away under steady foot
pressure is generally the result of a system leak. The
leak point could be at a brakeline, fitting, hose,
wheel cylinder, or caliper. Internal leakage in the
master cylinder caused by worn or damaged piston
cups, may also be the problem cause.
If leakage is severe, fluid will be evident at or
around the leaking component. However internal
leakage in the master cylinder will not be physically

evident. Refer to the cylinder test procedure in this

I think by this if you don'thave any leakes on the garagefloor then it must be in the master cylinder..if the plunger is worn fluid can just slide by the plunger and not build up any pressure.. If not there then maybe a diafram in the booster is bad or a bad check valve. . Hope this helps..

Last edited by 94zjdriver; Jan 5, 2012 at 11:51 PM.