Brake Issues
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Senior User
Joined: Nov 2007
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From: McFarland, WI
Brake Issues
Well it seems that you fix one thing and another thing goes. This past weekend, I did a whole lot of work. New custom bumper, bedliner, Stoped a bunch of rattles, and replaced a bunch of wires. But not when I push the brakes, its like I have the key in the off posittion. I checked for a vaccum line to be off but all are connected. On the right side of the motor, there is a vacumm line going into a diaphragm looking thing with 3 wires coming out of the other side. When I take that vac line off it is sucking but it doesnt seem very hard. Any other idea? Does any1 know how much vac pressure that line should have? Thanks in advance.
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Senior User
Joined: Nov 2007
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From: McFarland, WI
I was thinking vacuum pump. When its running you can kinda hear the vac pump...well...pumping, is that normal? Ive never noticed it before. What about the Vac reservoir. The coffee can on the left rear corner of the engine compartment.
What does that do? And what would happen if that went bad?
What does that do? And what would happen if that went bad?
Last edited by IB Tim; Nov 12, 2007 at 06:06 AM.
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Joined: Apr 2007
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From: Conway, AR
If the coffee can rusts out, you will have a big vacuum leak. It just holds a larger area of lower than atmospheric pressure ( vacuum ) so when you apply brakes or something else vacuum operated is used, you have a steady vacuum supply.
You can pickup a vacuum gauge cheap and check the overall system and the pump.
Easy check geet a big vacuum plug assortment and plug off everything except for the brake booster and see if that gives you brakes, if so, re attach the other lines one at a time till you find the circuit with the leak.
If that doesn't help, either the pump is bad or the brake booster, but you'll need a gauge to check the pump for sure.
--------Robert
You can pickup a vacuum gauge cheap and check the overall system and the pump.
Easy check geet a big vacuum plug assortment and plug off everything except for the brake booster and see if that gives you brakes, if so, re attach the other lines one at a time till you find the circuit with the leak.
If that doesn't help, either the pump is bad or the brake booster, but you'll need a gauge to check the pump for sure.
--------Robert
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Senior User
Joined: Nov 2007
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From: McFarland, WI
Yeah ill be looking for a gauge tomorrow.Another thing I noticed is the vent only blew air out of the dash vents and not the floor or anything else. I heard something about a default setting or something when there is no vacuum, it does that or something. Have yall heard anything about that. I know the vents are controlled by the vac so maybe another sign of a bad pump
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
The heater defaults to defrost when you loose vacuum.
The vacuum sensor is the thing on the passenger side inner fender well.
When it works right, it turns the brake light on when you loose vacuum, so you know you have very little braking.
The vacuum sensor is the thing on the passenger side inner fender well.
When it works right, it turns the brake light on when you loose vacuum, so you know you have very little braking.
