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03-28-2003, 04:39 AM
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#1 |
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Registered User
Join Date: Mar 2002
Location: KC, NW Missouri
Posts: 144
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Power(less) Brakes?!?
Is there a method for checking your power brake booster? My brakes are gradually losing thier ability to stop. Normally the truck seems to brake okay. But in a fast, hurried stop, the truck wants to keep rolling (not much, but noticeably). Though not desirable, shouldn't you be able lock up all four wheels in a hard braking? I've recently replaced the master cylinder and proportioning valve (they were leaking),and throughly bled the system per the Chevy manual. The brake pedal is solid, not spongy, and doesn't need to be pumped. Also, the truck stops straight, doesn't pull to either side at all. There's plenty of lining on the brake shoes and pads. It just seems I'm not getting much assistance from the booster (which will hold vacuum overnight).Replaced the vacuum hose, no difference. Just hope it's something simple.
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03-28-2003, 08:17 AM
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#2 |
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CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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Did the truck stop correctly before you replaced mc and pv?
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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03-28-2003, 08:21 AM
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#3 |
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Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,831
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A post this week use this method for checking the booster:
Pump up the brakes (before starting the engine), keeping your foot on the brakes after pumping them up. Start the engine, if the peddle goes down, means they booster is still working. If its solid, replace....
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1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
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03-28-2003, 08:47 AM
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#4 |
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English Chevy Owner
Join Date: May 2002
Location: Shropshire, UK/ Lot, France
Posts: 1,848
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Just remember, a booster doesn't make your brakes work any better, it just takes away some of the pedal effort needed. If the brakes aren't stopping you it may be that they either need adjusting or you've got contaminated linings/pads.
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Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission |
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03-28-2003, 10:24 AM
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#5 |
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It's a catastrophic success.
 
Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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A lot of times you can hear a vacuum sucking sound from a leaking diaphram in the booster
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