help with 8.8 disk brakes

bruisednanner · Jun 9, 2010

i just installed a 8.8 disk brake axle in my wifes 90 xj it was in my 88 for 4 years and worked fine (i put 60's in mine) but now in hers i can't get any brakes to work on the rear i put new pads good rotors and can feel the calipers moving but it wont hardly stop any and all help apprecated

slapshot · Jun 9, 2010

I'm assuming you bled the new system. Maybe the stock prop valve isn't getting enough fluid to the rears.

bruisednanner · Jun 10, 2010

yeh bleed out realy good even took the spring out of the perpotion vale

Begster · Jun 10, 2010

You took the spring out of the prop valve?

Kittrell · Jun 10, 2010

Calipers on the wrong side? Bleeder screw should be on the top.

cracker · Jun 10, 2010

Kittrell said:
Calipers on the wrong side? Bleeder screw should be on the top.

Could be the MC too. It is REALLY hard to goof up that set up on the explorer brakes.

Kittrell · Jun 10, 2010

cracker said:
Could be the MC too. It is REALLY hard to goof up that set up on the explorer brakes.

I'll admit I've never touched an 8.8, what don't I know?

cracker · Jun 10, 2010

Kittrell said:
I'll admit I've never touched an 8.8, what don't I know?

There isn't really anything to know. If you can do Dana 30 brakes, you can do an 8.8 brake. It is just a basic disc brake design.

I suspect there might be another issue other than the rear brakes themselves. Could be the MC or the prop valve I would assume.

I have also seen idiots put the brake lines reversed from the prop valve to the master cylinder and the brakes sucked too. :doh:

Kittrell · Jun 10, 2010

cracker said:
There isn't really anything to know. If you can do Dana 30 brakes, you can do an 8.8 brake. It is just a basic disc brake design.

I suspect there might be another issue other than the rear brakes themselves. Could be the MC or the prop valve I would assume.

I have also seen idiots put the brake lines reversed from the prop valve to the master cylinder and the brakes sucked too. :doh:

Oh, I was thinking it was something to the effect of the left not bolting up to the right. Just ruling out the simple stuff first............

NorcalXJnewbie · Jun 10, 2010

I seen them bolted up wrong.... That will do it

cracker · Jun 10, 2010

Kittrell said:
Oh, I was thinking it was something to the effect of the left not bolting up to the right. Just ruling out the simple stuff first............

No worries. Actually the left can bolt up to the right (and vice a versa)and you are right that the bleed screw can be wrong when doing that. I would assume that since it worked for 4 years preciously they were on their respective sides (right on the right;left on the left).

bruisednanner · Jun 15, 2010

thanks for the input guys turned out ther must have ben some trash in the lines we bleed them some more and got it out they are working good now

joe_peters · Jun 19, 2010

Question: are you still using the single-diaphragm booster of the 90? If so, you aren't getting near the brakes you could if you upgrade to the 95-96 dual diaphragm booster.

help with 8.8 disk brakes

bruisednanner

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slapshot

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bruisednanner

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Begster

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Kittrell

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cracker

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Kittrell

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cracker

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Kittrell

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NorcalXJnewbie

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