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Have 1993 Chevrolet P30 with 454 engine.Lacks power on hills and for unknown reason right rear brake caliphers pick-up. Shut off engine, wait 5 min. and restart, brakes release and able to continue.....until next "call for power" problem repeats. ?

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  • Chevrolet Master
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Hello..I'm not sure what you mean when you say
"right rear brake calipers pick-up."

If you have power brakes with a brake booster, vacuum decreases in the power booster as the throttle opens. If you have a hydra boost system, the power steering pump provides the power assist. All system components (master cylinder, power steering pump or booster, power brakes proportioning valve, lines and fittings, calipers and pads and emergency brake) all need to be in good condition with no leakage or out of spec adjustments... to perform properly.

As you are loosing power while under heavy load uphill I would first check to confirm none of the brake calipers are hanging up (lift each wheel and check for free travel..no drag with brakes and emergency brake off)

The exhaust systems ability to flow freely is also critical. A plugged up exhaust system will not allow the free flow of exhaust gasses and severely limit the available power output of the engine...like driving with the choke plate closed.

Check here for more information about brake bleeding:


RV Net Open Roads Forum info Chevy P30 hydro boost brake power sterring...

Posted on Aug 12, 2017

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SOURCE: Back brake lights do not

Right at the brake pedal there is a brake light switch that can stuck in the closed position keeping the brake lights on. One way to test it is by removing one of the wires to it, if the light shuts, must be replaced.

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SOURCE: Mustang parking brake won't release tension on rear brakes

since the new pads are alot thicker than the old ones,the brake needs to be set properly.
something is not right for sure.
the retainer for the park brake cable may be not in the right spot.there is two places it can fit.

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SOURCE: engine revs remain high or increase when braking

Have you tried checking your throttle positioning sensor. Possible vacuum leak or check for carbon build up in the throttle body not letting the throttle valve shut all the way.

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monkeybear45
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SOURCE: 2004 titan engine shuts off without warning.

Did some research for you on this problem. Go to this Titan forum link I am sending you.....First post sounds a lot like your problem. I'll still look around and make some calls....

http://www.nissantitan.info/forum_posts.asp?TID=2726&PN=1

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SOURCE: Mazda 323 fuel injection1994 accelerator problem

Try changing the fuel filter. If it clogs up the engine won't get the fuel it needs to run at wide throttle openings, the engine will ****** the timing, and you'll lose power. With less throttle the filter can flow well enough for the engine to run properly.

Posted on May 16, 2010

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