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Old 04-25-2014, 11:19 AM
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Breaks not working properly

Hello ppl, got a question that hopefully with your help i can resolve. i have 99 jeep grand cherokee laredo 4.0 2wd and the problems i have is that my breaks dont seem to be working properly. When i break it seems to take a lot of effort to come to a stop and when at a complete stop it seems like i have to keep a lot (well not a lot but most definitely a much greater amount than in any other of my vehicles, enough to know its not right).

previously i though that it was the rear breaks not helping the front so i replaced the rear break pads, and it felt great and normal but only for a while but now its back to the same. Checked the break booster vacuum house and seems to work properly, break fluid does not leak.

Anybody got any ideas as to what could be causing this?


P.S. im thinking this might be the reason why the jeep is horrible in winter since its rear wheel drive only the front would break but rear would not so much so i would skid because only the front was trying to break, and when in a complete stop i would not finish depressing the break and the jeep would go sideways because the rear was pushing the front that was still breaking.
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Old 04-25-2014, 11:44 AM
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Re: Breaks not working properly

Did you already check for air in the brake lines? I would at least check the rear brakes for any air pockets. Let someone push the brake pedal and while doing so, release the bleed nipple on the brake actuator on each side a bit to check for air. If it was a long time ago since brake fluid was changed, its maybe a good time now to change it (best is to change brake fluid after 2 years of use, because it takes moisture from the air).
Could eventually be a problem with the brake master cylinder or clogged brake lines/hoses. Did you check if both rear brake actuators work when pressing the brake pedal?
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Old 04-25-2014, 11:52 AM
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Re: Breaks not working properly

hmm did not think about bleeding the system will definitely look into that today after work, and wouldn't the rear break actuator be only for the parking break?
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Old 04-25-2014, 12:51 PM
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Re: Breaks not working properly

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Originally Posted by jaxter009 View Post
hmm did not think about bleeding the system will definitely look into that today after work, and wouldn't the rear break actuator be only for the parking break?
No, the parking brake is completely mechanical and the shoes are operated by a mechanical actuator. The hydraulic actuator is for normal brake use and only actuates the disc brake.
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Old 04-25-2014, 01:17 PM
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Re: Breaks not working properly

ahh ok well is there anything that im supposed to look for in the actuator, because like i said when i put the new rear breaks it worked fine for a while but then it went back to the same...so can they work half ass or is it a matter of yes they work or no they dont work.
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Old 04-25-2014, 01:44 PM
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Re: Breaks not working properly

The master cylinder has a primary and secondary piston. The primary is for the front brakes and the secondary for the rear brakes. A failure of the secondary piston or seals could cause low brake pressure to the rear, eventhough changing the rear pads should not make any difference on the function. Jack up the rear and check if you can turn the rear wheels when pressing the brake pedal. They should stay fixed even when using a bar on one of the wheel nuts. If the wheel turns with ease, then there is a problem. The problem then could be the master cylinder, dirt in the master cylinder secondary piston inlet or a problem with the rear wheels ABS function. The front wheels have each their own channel for ABS function, but the rear wheel work in tandem and only have one channel for both, releasing both rear brakes when a rear wheel slip is detected. So a failure there would influence both rear brakes. There is no ABS fault light on the instrument panel?
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