ABS bypass yes or no?
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More Turbo
Joined: Jan 2010
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From: Western NC mountains
ABS bypass yes or no?
88 f350 trying to.get a firmer pedal. New rear and front brakes rears adjusted new rightside caliper new wheel cyls. 3rd master cylinder. Adjusted shoes multiple times. Bypass or just bleed abs? I do think my vac pump is weak or a leak in booster diaphram i only get 2 pedal pushes before pedal gets hard and takes 4 or 5 sec to build vac back up. Truck stops.just as easy with engine off as it does running just hard pedal off.
Elder User
Joined: Mar 2013
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Hard pedal when with the engine running means you have little to no assist. Bypassing the ABS will not make the pedal firmer. Also that may make your braking more interesting. I suggest leaving the ABS if its working ok.
If you press the brake pedal do you hear a hissing noise? You might try applying the brake after shutting down the engine so you can hear it. Thats usually an indication of the vacuum boosted failing or already failed.
If you press the brake pedal do you hear a hissing noise? You might try applying the brake after shutting down the engine so you can hear it. Thats usually an indication of the vacuum boosted failing or already failed.
Last edited by Gettysburg150; Jan 9, 2014 at 11:21 AM. Reason: Typo
Thread Starter
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More Turbo
Joined: Jan 2010
Posts: 685
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From: Western NC mountains
Huh? Im not trying ro fix a hard pedal i want it firmer. It takes me a mile to stop ( lol thats somewhat inflated) realize a bad booster causes a hard pedal just dont think that would cause a very soft and sinking pedal
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
lack of vacuum will give the same feeling as no brakes, because you will really have to stand on the brakes to get them to work.
i bypassed the ABS on my 88 back when it was still new because it gave me sometime brakes.sometimes they worked, but most of the time they did not.
so i got rid of the ABS. brakes have been great ever since, except for the three times the vacuum pump died.
i bypassed the ABS on my 88 back when it was still new because it gave me sometime brakes.sometimes they worked, but most of the time they did not.
so i got rid of the ABS. brakes have been great ever since, except for the three times the vacuum pump died.
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More Turbo
Joined: Jan 2010
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From: Western NC mountains
Lol jas. Thats one of those why didnt i think of that moments. Thats awsome i laughed out loud on that one. Vac pump booster and rear abs is all that remains. What should vac be on booster hose? Both may be bad. I do hear squishy noise with engine off.
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Post Fiend
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From: Ottawa, Ontario
I think hes got the same problem my F350. Pedal is to SOFT and goes to the floor before it starts braking.
If I pump it, it comes up. I bled over the front brakes when I replaced a front caliper (other side was already new), and didn't really help. I won't touch the back for now, as i'm gonna break off the bleeders, and then i'll break the lines to replace the wheel cylinders.
I have heard the ABS box can cause a low soft pedal.
If I pump it, it comes up. I bled over the front brakes when I replaced a front caliper (other side was already new), and didn't really help. I won't touch the back for now, as i'm gonna break off the bleeders, and then i'll break the lines to replace the wheel cylinders.
I have heard the ABS box can cause a low soft pedal.
Elder User
Joined: Mar 2013
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I read something wrong, who knows what I was thinking lol
If your RABS is messed up I also heard that could cause a soft pedal. I've seen where guys have taken them apart and cleaned/rebuilt them with success.
Bad wheel cylinders, master cylinders, and the ABS block being messed up could cause a soft pedal.
So you get 2 applications then you have to pump the brakes?
If your RABS is messed up I also heard that could cause a soft pedal. I've seen where guys have taken them apart and cleaned/rebuilt them with success.
Bad wheel cylinders, master cylinders, and the ABS block being messed up could cause a soft pedal.
So you get 2 applications then you have to pump the brakes?
Laughing Gas
Joined: May 2009
Posts: 854
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From: Maine
I think hes got the same problem my F350. Pedal is to SOFT and goes to the floor before it starts braking.
If I pump it, it comes up. I bled over the front brakes when I replaced a front caliper (other side was already new), and didn't really help. I won't touch the back for now, as i'm gonna break off the bleeders, and then i'll break the lines to replace the wheel cylinders.
I have heard the ABS box can cause a low soft pedal.
If I pump it, it comes up. I bled over the front brakes when I replaced a front caliper (other side was already new), and didn't really help. I won't touch the back for now, as i'm gonna break off the bleeders, and then i'll break the lines to replace the wheel cylinders.
I have heard the ABS box can cause a low soft pedal.
I, too, have heard ABS can cause this. What I know is, it sounds like a MC problem.
Roy
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More Turbo
Joined: Jan 2010
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From: Western NC mountains
3 master cyls all act the same. 2 new ones not remans. Booster or vac pump is bad cause after about 2 pumps pedal gets hard engine running and takes 4 or 5 sec to get vac to make it easy to push again.