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07-30-2016, 03:54 PM
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#1 |
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Registered User
 
Join Date: Jun 2004
Location: On The Beach, S C
Posts: 613
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Brakes grabing
1985 - Changed both front rotors, calipers, lines, porportioning/metering valve, and right front still grabs. Input appreciated.
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4oldcars Driving: 1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado The ones I let go: 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 long bed, 03 short bed |
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07-30-2016, 04:07 PM
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#2 |
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Registered User
Join Date: Jul 2016
Location: Sutherlin, Oregon
Posts: 162
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Re: Brakes grabing
Low air pressure in one tire, kink in hydraulic line, alignment in one wheel way off so tire isn't flat to pavement equals less area. Hope one of these helps.
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07-31-2016, 08:26 AM
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#3 |
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Registered User
Join Date: Apr 2010
Location: Guntersville Alabama
Posts: 1,073
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Re: Brakes grabing
When you say lines . What lines did you change . Was it the rubber hoses or the steel lines . If you changed hoses did you check the steel lines for a blockage ( blow them out ) . What does right front grab mean . Is the right front brake staying applied when you let off the pedal or is it pulling to the right only when pedal applied .
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07-31-2016, 10:35 AM
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#4 |
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Registered User
Join Date: Jun 2004
Location: On The Beach, S C
Posts: 613
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Re: Brakes grabing
Rubber and steel lines were replaced. Steel lines from metering valve to each side only. Right front wheel grabs/locks. Releases when pedal is released. If this makes any difference, the pedal seems low. Firm but low, nearly on the floor. Master cylinder "appears" new (by PO?). Just got this truck. Afraid to drive it. Guess I know why PO wanted to sell. Appreciate the input.
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4oldcars Driving: 1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado The ones I let go: 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 long bed, 03 short bed Last edited by 4oldcars; 07-31-2016 at 10:46 AM. |
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07-31-2016, 11:33 AM
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#5 |
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Registered User
Join Date: Oct 2014
Location: mi
Posts: 359
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Re: Brakes grabing
Does the break fluid Rez have enough Fluid? How old are the calipers? Do u need to bleed the breaks?
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TJ 76 gmc 1500 swb patina finish Dropped 4/5, 350/4 speed 80 Chevy c10 lwb 305/350 |
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07-31-2016, 04:26 PM
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#6 |
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Registered User
Join Date: Jun 2004
Location: On The Beach, S C
Posts: 613
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Re: Brakes grabing
Did the rear brakes today. New drums, cylinders, and shoes. I don't know why, but now the front brakes are working fine. All brakes working as they should. Thanx to all.
__________________
4oldcars Driving: 1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado The ones I let go: 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 long bed, 03 short bed |
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07-31-2016, 06:22 PM
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#7 |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,189
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Re: Brakes grabing
On my C20, the rear axle "wheel seals" or axle seals leaked and got the shoes and drums wet, so they grabbed and lost braking intermittently. I had new style two piece wheel seals installed which stopped the leak.
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07-31-2016, 07:25 PM
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#8 |
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Registered User
Join Date: Jul 2016
Location: Sutherlin, Oregon
Posts: 162
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Re: Brakes grabing
What do 2 piece seals look like, or how do they work?
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