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01-31-2011, 01:49 AM
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#1 |
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Registered User
Join Date: Jan 2011
Location: Post Falls, ID
Posts: 16
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Rear brakes locking up too early.
I just fixed my brakes by replacing the master cylinder, a caliper, a wheel cylinder, and a hose, but now I have a new problem.
My rear brakes are locking up too early. Is my proportioning valve bad or can an air bubble in a front brake cause this. I'll admit that I ran out of daylight and didn't finish bleeding the front left as well as I could have.
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1982 C20 |
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01-31-2011, 09:18 AM
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#2 |
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Registered User
Join Date: Feb 2009
Location: washington the state
Posts: 730
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Re: Rear brakes locking up too early.
I'd go with air in the lines
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my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG |
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01-31-2011, 10:04 AM
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#3 |
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Registered User
Join Date: Sep 2008
Location: Bailey, NC
Posts: 2,462
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Re: Rear brakes locking up too early.
It could be air in the lines or the rear brakes adjusted too tight. Try gravity bleeding the brakes then a manual bleed then try it again.
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Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT |
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01-31-2011, 12:22 PM
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#4 |
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Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Re: Rear brakes locking up too early.
If the brake shoes are soaked with brake fluid from that wheel cylinder you replaced they will lock up when you hit the brakes.
Slonaker |
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01-31-2011, 12:54 PM
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#5 |
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Registered User
Join Date: Sep 2008
Location: Bailey, NC
Posts: 2,462
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Re: Rear brakes locking up too early.
True. Forgot about that.
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Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT |
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01-31-2011, 02:51 PM
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#6 |
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Registered User
Join Date: May 2010
Location: Shreveport, LA
Posts: 115
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Re: Rear brakes locking up too early.
Air in the lines. My older brother went through this a few years back. Replaced his front brakes and master cylinder and that happened. He replaced the entire brake system except the hard lines to the rear before he figured out it was air.
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81 GMC C15 RC SWB 5.3L 4L80E project 
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01-31-2011, 06:58 PM
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#7 | |
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Registered User
Join Date: Mar 2009
Location: MD
Posts: 417
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Re: Rear brakes locking up too early.
Quote:
Happened to me once, it was pretty darn scary on the highway when the one rear wheel locked up and howling as it was dragging at 55mph. 
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2006 Silverado Crew Cab 1500 4x4 5.3L automatic 1986 M1008 CUCV 6.2L Detroit Diesel TH400 4.56 Detroit Locker rear NP208 1973 K20 "Silverado" 350ci, HEI, TH350, NP203 with 2wd conversion, A/C, power windows,tilt wheel, dual tanks. My '73ish K20 thread My 5yo son claims it as his. 1987 V20 Custom Deluxe 350 TH400 NP208 "farm truck" getting parted out. 2016 Nissan Altima grocery getter/commuter |
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01-31-2011, 07:46 PM
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#8 |
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Registered User
Join Date: Aug 2010
Location: Virginia Beach, VA
Posts: 64
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Re: Rear brakes locking up too early.
air in line. or ya got rears adjusted too tight.
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