Brake Bleeding With RABS
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Laughing Gas
Joined: Jan 2006
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From: Minnesota
Brake Bleeding With RABS
98 F-150, rear drums, discs. on front. Replaced all rotors, drums, pads and shoes. Still has a low brake pedal and a little spongy. Rears are adjusted correctly, so that is not it. I pulled the back two cylinders and under one cup it was wet, so I replaced that one. Bled it correctly the old fashioned 2- man method....(OK....wife and I), RR then LR....got all the air out. It is better....but being the old **** guy I am...not quite right. A year ago the RABS module for the rear only ( located right under the MC) corroded off the terminals, so I tossed in a used one and got the ABS light to go off. I did the quick bleed by cracking the line from the ABS module that takes off to the rears. It was "OK" but I always felt it was a little mushy. It has a bleeder on it, so my question is do you bleed the RABS first then the back two wheels? That would seem to make sense. Since it is rear only there is no "motor" in the RABS unit that would have to be activated to bleed them. As always, any input is appreciated.
Jeff
Jeff
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Joined: Aug 2005
Posts: 4,728
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From: Cleveland, TN
98 F-150, rear drums, discs. on front. Replaced all rotors, drums, pads and shoes. Still has a low brake pedal and a little spongy. Rears are adjusted correctly, so that is not it. I pulled the back two cylinders and under one cup it was wet, so I replaced that one. Bled it correctly the old fashioned 2- man method....(OK....wife and I), RR then LR....got all the air out. It is better....but being the old **** guy I am...not quite right. A year ago the RABS module for the rear only ( located right under the MC) corroded off the terminals, so I tossed in a used one and got the ABS light to go off. I did the quick bleed by cracking the line from the ABS module that takes off to the rears. It was "OK" but I always felt it was a little mushy. It has a bleeder on it, so my question is do you bleed the RABS first then the back two wheels? That would seem to make sense. Since it is rear only there is no "motor" in the RABS unit that would have to be activated to bleed them. As always, any input is appreciated.
Jeff
Jeff
Thread Starter
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Laughing Gas
Joined: Jan 2006
Posts: 1,098
Likes: 11
From: Minnesota
Yeah...been bouncing around the 'brake section" here and that seems to be the answer. Maybe I'll wait for some more input before I bleed the RABS. Thank You for the response !!
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Laughing Gas
Joined: Jan 2006
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From: Minnesota
I went out and looked on the RABS module and there was a nipple on the side of it.....bigger than what you see on a wheel cylinder. It had a rubber cap on it that I pried off. It took a 24mm socket to loosen it and nothing runs out even when hitting the pedal. So I took it out and behind it was a spring that puts some pressure on that cap and nipple. It was clean and not plugged. I screwed it back in and I am leaving it alone since I have no clue if that should bleed or what....
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Laughing Gas
Joined: Jan 2006
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From: Minnesota
Senior User
Joined: Nov 2003
Posts: 423
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From: Providence, RI
Did your pedal ever become firm?
I've got a new-to-me '98 with the RABS, and can't get a firm pedal after flushing a quart of fluid through the system.
I've got a new-to-me '98 with the RABS, and can't get a firm pedal after flushing a quart of fluid through the system.
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Senior User
Joined: Oct 2011
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A squishy break pedal is a common problem on the older f150's 97 to i think about 99. from what i have found there is really no fixing this problem. i had a 97 4.6l and from the day i bought it it had a soft pedal. and i know of and have driven several other older f150's with the same problem. Even after putting all new pads and running all new break lines they were still the same. from what i know there is not a fix. but maybe someone will chime in with a better answer.
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Elder User
Joined: Apr 2012
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From: Tamaroa, IL
I have a 1997 F-150 4x4 4.6L I have replaced everything except a few front brake lines, and my pedal has ALWAYS been soft. I've replaced front calipers and pads, rear wheel cylinders and shoes, rear brake lines from the master cylinder back, and nothing has improved my pedal feel. The truck stops fine, just has a soft pedal.
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Laughing Gas
Joined: Jan 2006
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From: Minnesota
Yes...it eventually got firmer and higher...took a few weeks. Have no idea why...Maybe the rear drums got centered in and "fit" better after a few hundred stops.
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