Brake problem - HELP PLEASE!!
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VT Chapter Ldr
Joined: Apr 2004
Posts: 96,118
Likes: 294
From: Orange, Vermont
Thanks tjc, I am going to a guy I know who owns a garage and have him test it also to confirm.
The other curious thing is that it seems like the brake light comes on as I loose my vacuum and then goes out after it builds back up. Is this sensing the decreased pressure on the fluid because of the loss of vacuum assist and if so why would it stay on until the vacuum build back up even after I have let the pedal come back up?
The other curious thing is that it seems like the brake light comes on as I loose my vacuum and then goes out after it builds back up. Is this sensing the decreased pressure on the fluid because of the loss of vacuum assist and if so why would it stay on until the vacuum build back up even after I have let the pedal come back up?
i ain't rite
Joined: Mar 2005
Posts: 65,514
Likes: 5,567
From: Marlboro Mental Hospital.
i am not up on the electrics of the newer trucks, so i will not comment and lead you in a wrong direction.
but i think you are looking in the rite direction with the pump if you can only get 11-12 inches.
what i do is hook the vacuum gauge up to the vacuum "T" on the firewall near the driver side valve cover and take a reading. then i step on the brake pedal a few times to monitor the pump. if will then disconnect the booster and plug the booster line and see if the vacuum goes up. this will rule out a leak in the booster if the vacuum rises drastically.
but i think you are looking in the rite direction with the pump if you can only get 11-12 inches.
what i do is hook the vacuum gauge up to the vacuum "T" on the firewall near the driver side valve cover and take a reading. then i step on the brake pedal a few times to monitor the pump. if will then disconnect the booster and plug the booster line and see if the vacuum goes up. this will rule out a leak in the booster if the vacuum rises drastically.
i ain't rite
Joined: Mar 2005
Posts: 65,514
Likes: 5,567
From: Marlboro Mental Hospital.
where do i go to find the vacuum pump Ed??
i was looking in the brake section but could not find it.
Former Vendor
Joined: May 2007
Posts: 1,811
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I couldn't find it either, dam 3rd party web catalog system, when it doubt anyone please use my contact us link and i'll send the link to you.
on this one have to do a search by part number.
Ed
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VT Chapter Ldr
Joined: Apr 2004
Posts: 96,118
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From: Orange, Vermont
A little update. I replaced the vacuum pump this weekend, now the vacuum is up to 22-23 inches and the brake light does not come on from repeatedly steeping on the brakes. I haven't test drove it but I think that problem may be fixed. I still have what I consider a falling brake pedal that falls faster then what I feel is acceptable. I did get another master cylinder to replace the other new one on it now that is leaking out the back some, so may be that will take care of some of it.
Has anyone ever left the vacuum gauge on and then pumped the brakes? I did and by pumping the brake rapidly, I could knock the vacuum down to 0 or close to it but it would recover pretty quick. Is that normal or would it indicate a leak in that. I did shut the truck off with the gauge still on it and did not see any drops over a minute, held 22-23 inches.
Has anyone ever left the vacuum gauge on and then pumped the brakes? I did and by pumping the brake rapidly, I could knock the vacuum down to 0 or close to it but it would recover pretty quick. Is that normal or would it indicate a leak in that. I did shut the truck off with the gauge still on it and did not see any drops over a minute, held 22-23 inches.
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