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05-29-2023, 11:09 AM
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#1 |
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Registered User
Join Date: Jan 2015
Location: Denver, CO
Posts: 26
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72 brake pedal soft and brakes grab- no feathering
Happens all the time. Can only slow down by locking up brakes?
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05-29-2023, 03:42 PM
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#2 |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,533
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Re: 72 brake pedal soft and brakes grab- no feathering
The most common cause of grabbing brakes is oil or brake fluid on the linings... Severely rusted drums or disks will also cause grabbing.. Have you tried jacking up the vehicle and removing wheels so you can take a look??
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05-30-2023, 03:25 AM
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#3 |
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Registered User
Join Date: May 2021
Location: Center Barnstead NH
Posts: 35
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Re: 72 brake pedal soft and brakes grab- no feathering
My rear brakes were doing this on my blazer. Had new shoes in it, they looked clean and dry but i replaced them anyway and problem went away!
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1972 C10 SWB 383 M22 1972 K20 454 1970 K5 1985 M1008 1986 M1008 2020 2500HD Duramax |
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05-30-2023, 06:01 PM
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#4 |
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Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,661
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Re: 72 brake pedal soft and brakes grab- no feathering
Agree with above. Also, power brakes?
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72 C10 lwb fleetside -stock 350/350 combo |
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05-31-2023, 08:13 PM
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#5 |
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Senior Member
 
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,121
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Re: 72 brake pedal soft and brakes grab- no feathering
Good advice from Rusty, but if that fails, I don't know, my experience with a bad Master Cyl. is the pedal is soft and the brakes barely grab. What happens when a booster fails?
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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05-31-2023, 09:43 PM
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#6 | |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,533
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Re: 72 brake pedal soft and brakes grab- no feathering
Quote:
With booster failure, what usually happens is the pedal gets extremely hard to push, EXTREMELY HARD, but no grabbing at the wheels. I've seen a few booster failures that take both feet to get the brakes to slow the vehicle. The following is for the OP.. When you say "soft pedal", do you mean a low pedal before brakes start to apply?? If so, I'd look at brake shoes out of adjustment or severely worn so much that the wheel cylinder pistons are at the end of their travel and fluid is leaking past them.. As I stated in my original post, remove and inspect... |
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