soft pedal after rear disc conversion - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 08-11-2012
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soft pedal after rear disc conversion

just did the rear disc conversion today and ended up with a soft pedal. the truck barely comes to a stop and the pedal is at the floor. i have gone over all the connections and they are tight and not leaking. i bled the rear two different times running half a reservoir through each caliper each time. i have not bleed the front, will bleeding the front help? any help is appreciated.

thanks
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Old 08-11-2012
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Yes try bleeding all four wheels.
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Old 08-11-2012
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Start at tire farthest from M/C. Then next closest until all four are done.
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Old 08-12-2012
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i've done it 4 times now with very little change. any other thoughts?
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Old 08-12-2012
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Maybe a leak. Check the calipers and all lines.
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Old 08-12-2012
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i found a slight leak at the rear caliper banjo bolts, it helped a little. now a i have a check engine light on, ill have to go get that read some where now.
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Old 08-12-2012
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Maybe you messed up a ABS sensor
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Old 08-12-2012
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How well is the master cylinder matched to the rear disc setup? I did a rear disc conversion once to a fullsize Bronco using rather large calipers, and wound up with a lot of travel in the pedal, because the M/C had to displace such a large amount of fluid to actuate the large calipers. It stopped pretty good, just the pedal had a lot of travel. The cure would have been switching to a M/C designed for rear disc in my case.

I would assume that you are using Explorer rear discs. What have others done when switching, if anything?

Is your truck equipped with a proportioning valve that is detrimental to you rear disc conversion?

Since repairing those leaks, bleed the system again. Then when you think it's good, bleed it again!

Oh, one last thing. Post a pic of your rear calipers, with the bleed screws in the pic. Post two if you have to.
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Old 08-12-2012
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Quote:
Originally Posted by big-blue-oval View Post
How well is the master cylinder matched to the rear disc setup? I did a rear disc conversion once to a fullsize Bronco using rather large calipers, and wound up with a lot of travel in the pedal, because the M/C had to displace such a large amount of fluid to actuate the large calipers. It stopped pretty good, just the pedal had a lot of travel. The cure would have been switching to a M/C designed for rear disc in my case.

I would assume that you are using Explorer rear discs. What have others done when switching, if anything?

Is your truck equipped with a proportioning valve that is detrimental to you rear disc conversion?

Since repairing those leaks, bleed the system again. Then when you think it's good, bleed it again!

Oh, one last thing. Post a pic of your rear calipers, with the bleed screws in the pic. Post two if you have to.
im using the mustang hardware, its all stock gt parts. a number of people have done it with no problems.

i fixed the leaks, bled it then bled it again with no change. if it had been stopping well i would have lived with the soft pedal.

i have the stock drums back on now and the pedal is back where it was and i have the battery disconnected to reset the code to see if it comes back.

im thinking im just going to stick with the drums and sell the disc parts.
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Old 08-12-2012
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Didn't happen to get a pic of the bleed screws did you? Which way were they oriented? They should be at the highest point of the fluid cavity, otherwise they won't let all the air out. It's a simple mistake to make, especially if you got the calipers mixed up side-to-side, or are mounting them in an orientation other than stock.

If others have done it, there shouldn't be a good reason you can't.
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Old 08-12-2012
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no i didnt, but now that you say that, i believe thats exactly what happened, i had the calipers upside down. fmylife, i already have the drums back on and im not sure i wanna tackle this again. thanks for you help.
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You've gone this far, go a little further.
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Old 08-12-2012
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true, hard lines are bent, tabs welded on. its truly bolt on at this point. gotta remember to bleed the lines and check the pedal before i put my diff cover back on this time. just gotta find the time to attempt this again.
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