1988 Bonne SSE Brake Pump - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-25-2011, 06:42 PM   #1
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Default 1988 Bonne SSE Brake Pump

The brake booster pump to the rear brakes is shot. I know if one can be found (new) they run $1000. Anyone know where I can find one a hole lot cheeper or does someone have one. Mine is the one that is all electronic, no vac. booster. Please help if you can.
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Old 02-25-2011, 07:08 PM   #2
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Take a look at www.rockauto.com for a new one, after that you can try the salvage yards, should find a good deal there.
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Old 02-25-2011, 08:57 PM   #3
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A little more info. We took the pump off and bench tested it and it works fine. What happens is when the brake light comes on the pump won't run and all I have is front brakes. Once in a while the pump will run and the brake light goes out an all the brakes work again. After pumping the brakes a few times the light comes back on and I lose the rear brakes again. Any ideas?
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Old 02-25-2011, 08:59 PM   #4
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Have you checked your brake fluid. Sounds like it'* low.
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Old 02-25-2011, 09:07 PM   #5
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New brakes front and rear. New rear cylinders and all has been bleed. Resavoir is full and no leakes at all.
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Old 02-25-2011, 09:23 PM   #6
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That light generally comes on when the fluid is low. I guess it'* possible the sensor is bad.
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Old 02-25-2011, 09:29 PM   #7
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Which sensor?
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Old 02-25-2011, 09:31 PM   #8
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The fluid level sensor. Do you have one on the master cylinder.
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Old 02-26-2011, 01:52 PM   #9
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If I may throw in my two cents..there is a place out here in California that rebuilds these ABSpumps and such, called Invasion Auto Products..just this week I dropped $300 to rebuild my ABS setup..worth a phone call...his name is Samson..1 877 42TURBO or 818 506-8005..
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Old 02-26-2011, 04:00 PM   #10
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It looks like we found the problem. There is a short in the harnes that comes down from the relay switch. When you shake that harnes around it will kick on the pump and then shut off when it is up to pressure. After you pump it up a few times the brake light comes on and the pump won't run again until you shake the wire harnes around again. There is a short in the harnes somewhere that I need to find now and then I think I have it licked. Can anyone send me a picture of the whole master cylinder. My shop book only has the one w that shows the one with the vac booster and not the type that is on my car.
Thank'* so much for the help.
Jess
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