Bleeding brakes
#1
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Year: 1999
Model: Cherokee
Engine: 4.0L
Bleeding brakes
Well I've completed my 8.25 axle swap with ZJ discs and ABS delete. The time has come to bleed the brakes and I can't get a decent pedal. For brakes I installed all new hard lines except for the long center one and the rear soft hose that connects to it., new soft hoses on rear calipers and new front extended brake lines. I removed the ABS pump, unplugged the large connector and pulled the relay/fuse.
I've gone around the brakes 6 times and bled them starting farthest from the MC. Good fluid comes out without any air from each caliper. The pedal gets firm but still slightly mushy if pumped up. If I wait 10 seconds and pump it again the pedal goes to the floor? If I watch the brake fluid level it goes down slightly when pumping the brakes but when you stop it slowly goes back to the full mark. And before anyone asks yes I've double checked all the fittings and they're not leaking.
I've bled brakes a million times but this is giving the a damn hard time! HELP!
I've gone around the brakes 6 times and bled them starting farthest from the MC. Good fluid comes out without any air from each caliper. The pedal gets firm but still slightly mushy if pumped up. If I wait 10 seconds and pump it again the pedal goes to the floor? If I watch the brake fluid level it goes down slightly when pumping the brakes but when you stop it slowly goes back to the full mark. And before anyone asks yes I've double checked all the fittings and they're not leaking.
I've bled brakes a million times but this is giving the a damn hard time! HELP!
#6
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Year: 1999
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Update, got a different caliper that's the right side up and I have pedal! It's still somewhat mushy and won't get any more firm. Brake booster is pulling good vacuum and MC doesn't appear to be leaking. Any opinions?
Last edited by JPXJMOAB; 03-16-2016 at 10:49 PM.
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#9
not trying to hijack this thread but I am also having trouble with my rear brake lines. I put extended brake lines in the rear with a new union as one comes with the kit. my problem is that when I was taking off my passenger side brake line I busted up the thread causing me to have to re flare the brake line and put it back into the new union on the axle tube. but my brake line is still leaking. what should I do to try to fix this? re flare it?
#11
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Year: 1999
Model: Cherokee
Engine: 4.0L
I haven't checked the reservoir in my XJ but in my other vehicle there is a wall inside the reservoir that splits the interior into two section: one to feed the front brakes and a second to feed the rear. This wall is there so that if you have a fluid leak in one circuit (either front or rear) you do not lose ALL of your fluid and therefore ALL of your braking.
The wall does not go to the very top of the reservoir so that the brake fluid can be shared by both, but if the fluid level drops too low while bleeding, you will drain only 1/2 of the reservoir and it can look as if there is still sufficient fluid. The rear section is smaller than the front so this wall is frequently located aft of the reservoir cap.
Check the reservoir very carefully to ensure that both sections have fluid.
The wall does not go to the very top of the reservoir so that the brake fluid can be shared by both, but if the fluid level drops too low while bleeding, you will drain only 1/2 of the reservoir and it can look as if there is still sufficient fluid. The rear section is smaller than the front so this wall is frequently located aft of the reservoir cap.
Check the reservoir very carefully to ensure that both sections have fluid.
#14
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When I've done extensive brake work in the past and replaced lines, calipers, etc, I've always had fantastic luck with a reverse bleed system along with bench bleeding the master cylinder. Other than that, I've always struggled as the OP has. They are a little pricey, but for me it was a tool I feel like I have to have for this type of work.
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02-21-2016 10:59 AM
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