Explorer 8.8 swap w/ disc brakes- low pedal problem
#1
Explorer 8.8 swap w/ disc brakes- low pedal problem
Hey all, I just swapped an explorer 8.8 axle into my 2002 ranger edge. new axle has disc brakes, my old 7.5 obviously had drums. After bleeding the brakes for a LONG time, and making sure there is no air in the system, i still have a strange low pedal feel in the brake pedal. The pedal goes low for a little bit when i first start driving the truck, then it will slowly build pressure and the pedal begins to feel good, but toward the end of a drive (5-10 mins of driving) the pedal feels TOO high, and the front brakes begin to drag even with no prssure on the pedal. My truck does have ABS, Im wondering if the unit that the master cylinder supplies fluid too before going to the wheels is the ABS unit? Or do i have a defective master cylinder? I tried adjusting the plunger coming out of the brake booster which applies pressure into the master cylinder, it did change the pedal feel but it still builds pressure then begins to drag. Im tempted to replace the master cylinder but im not a fan of throwing parts at a car without knowing thats legitimately wrong with it. Especially when it comes to a safety item such as brakes.
Thank you for all your help!
Thank you for all your help!
#2
Old Guy User…
iTrader: (12)
First I have heard that the system adjusts for the disc brakes.
Second, did you start with the wheel that is the farthest away from the master, then the next closest, etc.
Use a Vac Pump to bleed them too, easier or a pressure bleeder, even better.
Last but not without merit go to a pro to have the system bled.
Second, did you start with the wheel that is the farthest away from the master, then the next closest, etc.
Use a Vac Pump to bleed them too, easier or a pressure bleeder, even better.
Last but not without merit go to a pro to have the system bled.
Last edited by Scrambler82; 10-03-2011 at 07:33 AM.
#6
thanks for all your input everyone. i ended up making a bonehead mistake and put the calipers on the wrong side when i assembled everything. bleeder screw was on the bottom of the caliper and i couldnt bleed the air out of them. swapped the calipers, bled the brakes and the truck stops perfect now. oh well, you live and you learn!
#9
why would you stagger the rears? the use the same line to the rear, I dont see any added gain from going from the normal RR, LR, RF, LF
#10
thanks for all your input everyone. i ended up making a bonehead mistake and put the calipers on the wrong side when i assembled everything. bleeder screw was on the bottom of the caliper and i couldnt bleed the air out of them. swapped the calipers, bled the brakes and the truck stops perfect now. oh well, you live and you learn!
Now we know right, for next time.
Bleeders up, never down
#11
when i did my 8.8 swap on my 99 with full abs I compared the master cylinders from my ranger and the from the 2000 explorer 8.8 donor vehicle and the only difference was my ranger master cylinder had a metering valve for the rear drums, so i removed it. the rear seemed to have more braking power.
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lifted97ranger
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06-06-2008 05:30 AM