need to know about brake system parts asap.

[BUCKYXJ]

Alright the shop said that the brake fluid in the truck is contaminated probably with power steering fluid. Which causes any rubber parts in the system to fail. So what all do I need to replace? I am planning on master cylinder, and rear wheel cylinders. do you think the calipers on the front need replaced, what other parts have rubber in them? Thanks for all the help guys.
DIG IT!

 

[BUCKYXJ]

He said it looks like power steering fluid.
So here are the parts I plan on replacing tomorrow.
Master Cylinder rebuilt $36.00
Rear wheel cylinders $22.00 for both
Spring kit for the rear $8.00 for both wheels
Front Calipers rebuilt $28.00 for both
anything else u guys think I should replace or anything else have rubber parts that contact the brake fluid?

 

[Eagle]

Yeah -- the rubber flex hoses connecting from the chassis to each caliper, and the one at the back from the chassis to the blcok on the rear axle. Those hoses are rubber, and if they swelled inside due to the contamination your braking will be severely compromised.

Saw the same thing happen to a friend's muscle car many years ago (actually, it was that way when he bought it, which is why he got it for a ridiculously low price). You need to replace EVERYTHING that has rubber in it.

Oh yeah -- the proportioning valve under the master cylinder has rubber o-rings. The FSM says that valve is not serviceable, so you're looking at a new (or junkyard) combination valve, too.

 

[Boatwrench]

Replace everything. And flush, flush flush all the residual out of the steel lines.

Never have done this to an XJ, but have done to plenty of Buicks. This makes a mess.

Disconnect the rubber hoses at the axles and leave off the new hoses.
Remove the combination valve.
Let the fluid drain from the OLD master cylinder out the metal lines to drip where the combination valve used to be. Fill the old master cylinder with fluid and let drain again.
Now replace the master cylinder and fill and let drain out of the lines to the combination valve.
If you have air blow air through the lines from the combination valve back to the axle. i have done this, but no longer recommend using mouth/lung pressure.
Install the new combination valve and pump new fluid through. Keep filling the master cylinder.
At the rear axle remove the wheel cylinders and blow air through the metal lines running athwart the Jeep on the top of the axle to clear of old fluid.
Install the new hoses, wheel cylinders and calipers.
Bleed brakes, the hand pump "Mighty-Vac" wil come in ahndy for this job.

Good luck,
Tom

and you need to find out how a petroleum based oil got into the system

 

[old_man]

Here is the question. How did it get "contaminated"? I have seen too many mechanics try and take advantage of people to trust what most say. Brake fluid can change color due to lots of issues.

 

[BUCKYXJ]

i used some brake fluid from a shelf in the father in laws garage. That is the best I can tell. I believe the shop cause they told me they really didn't have the time to mess with it. Also this isn't the XJ this im my chevy 1500 tow rig.
DIG IT!