Vacuum Asst. Brake Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**WorkinLonghorn** · 12-23-2024, 04:43 PM

Hi. On my '69 2500 when the engine is running and I apply the brakes the peddle doesn't come all the way back up. I have to hook my foot behind the peddle and lift it up. When I shut off the engine, the peddle comes up as it should. Vacuum canister? This has me perplexed as I just replaced this part in '97. haha, jk. Or master cylinder? Thanks, -BA

Oh, when I shut then engine off I hear the vacuum hissing for a couple seconds and this never happened before. OK, probably the vac unit right?

**pjmoreland** · 12-23-2024, 06:35 PM

Sounds like it could be vacuum booster related, but does your brake pedal still have the return spring attached to the top end of it up under the dash near the brake light switch?

https://classicparts.com/1967-77-bra...-return-spring

**WorkinLonghorn** · Yesterday, 01:47 PM

I think I checked this and actually added a couple springs but the peddle is pretty difficult to raise. It's not like it is hanging limp or something, it seems as though the brakes are even dragging a bit. Must be that vac unit me thinks. Thanks

12-23-2024, 04:43 PM	#1
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,886	Vacuum Asst. Brake Question Hi. On my '69 2500 when the engine is running and I apply the brakes the peddle doesn't come all the way back up. I have to hook my foot behind the peddle and lift it up. When I shut off the engine, the peddle comes up as it should. Vacuum canister? This has me perplexed as I just replaced this part in '97. haha, jk. Or master cylinder? Thanks, -BA Oh, when I shut then engine off I hear the vacuum hissing for a couple seconds and this never happened before. OK, probably the vac unit right? __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

12-23-2024, 06:35 PM	#2
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,988	Re: Vacuum Asst. Brake Question Sounds like it could be vacuum booster related, but does your brake pedal still have the return spring attached to the top end of it up under the dash near the brake light switch? https://classicparts.com/1967-77-bra...-return-spring

Yesterday, 01:47 PM	#3
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,886	Re: Vacuum Asst. Brake Question I think I checked this and actually added a couple springs but the peddle is pretty difficult to raise. It's not like it is hanging limp or something, it seems as though the brakes are even dragging a bit. Must be that vac unit me thinks. Thanks __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

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