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BRAKE RELEASE ISSUES / 78 MAGNUM #1638152
06/24/14 11:29 PM
06/24/14 11:29 PM
Joined: Jan 2003
Posts: 10,353
S.E.Ohio
Magnumguy Offline OP
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S.E.Ohio
Replaced both front calipers (rebuilt) and hoses on my 78 Magnum. It seems like they're not releasing as the should, as when i raise either one they're hard to turn, even worse w/the wheel/tire off.

Any clues? Pads are correct, dead-on matches to the ones removed. Also had an awful time getting them bled as well.

Last edited by Magnumguy; 06/24/14 11:48 PM.

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Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: Magnumguy] #1638153
06/24/14 11:51 PM
06/24/14 11:51 PM
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Lincoln Nebraska
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RapidRobert Offline
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I'm assuming the wheel bearing adjustment is OK. Cranck a bleeder & see if it is a PSI problem. I had that on one corner & a $15 rebuild caliper took care of it. Before it was too hard to turn it & with another caliper it was much easier to bearhug/turn the wheel which as you know is normal EDIT provide more info on what was going on with the bleeding

Last edited by RapidRobert; 06/24/14 11:54 PM.

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Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: RapidRobert] #1638154
06/25/14 12:12 AM
06/25/14 12:12 AM
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S.E.Ohio
Magnumguy Offline OP
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Both calipers are "new". The bleeding took FOREVER. Just wouldn't pump up. Finally got some pedal, left it set an a week later they were fine.


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Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: Magnumguy] #1638155
06/25/14 12:26 AM
06/25/14 12:26 AM
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Kent, Wa
340SHORTY Offline
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check valve in master not releasing, Proportioning valve needs reset.. is the booster releasing all the way ??


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Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: 340SHORTY] #1638156
06/25/14 09:36 AM
06/25/14 09:36 AM
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S.E.Ohio
Magnumguy Offline OP
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Quote:

Proportioning valve needs reset..




How is that done?

Quote:

is the booster releasing all the way ??




As far as I can tell it is.


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Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: Magnumguy] #1638157
06/25/14 09:45 AM
06/25/14 09:45 AM
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Lincoln Nebraska
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RapidRobert Offline
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didn't realize it was PB. crack a bleeder & if that frees it then close the bleeder & pump it up & undo the MC to booster bolts & pull the MC forward a bit & see if that frees it. If so take the bolts the rest of the way off & pull the MC forward so you can get at the rounded pushrod threaded nub & shorten it till you have a slight bit of clearance between the round nub and the bottom of the piston recess "thimble" in the back of the MC


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Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: RapidRobert] #1638158
06/25/14 12:47 PM
06/25/14 12:47 PM
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Grand Prairie,Texas
stumpy Offline
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RR it isn't logical that the adjustment on the booster would change with just a hose and caliper replacement. I would look at the new caliper pistons being tight in their bore and not releasing all the way. I would say drive it for a little bit and see if things loosen up.

Re: BRAKE RELEASE ISSUES / 78 MAGNUM [Re: stumpy] #1638159
06/25/14 01:21 PM
06/25/14 01:21 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

RR it isn't logical that the adjustment on the booster would change with just a hose and caliper replacement.


Agreed, I missed that part. for it to start after a caliper replacement I would concentate my efforts there for what is mechanically hanging up


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