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

Draggn66 · 10-31-2006, 03:54 PM

.....I have checked the booster on my 71 by pushing the pedal down then starting the engine and the pedal goes down a bit farther. If I understand right then that means the booster is good right? My question is could it still be bad? Everything else in the brake system is new and although it stops ok the pedal is still hard. Not quite as bad as when the vacuum line is disconnected but close. Would a new booster make the pedal feel better? Looking for opinions. TIA

krue · 10-31-2006, 04:28 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=182131
Try that.

BarryB · 10-31-2006, 06:33 PM

Basically all a booster is. Is a big diaphragm. You can rebuild this things with only a little trouble. They are sealed by a grease ring basically and when the grease gets dry it cracks, and you lose vacuum. I have taken them apart and replaced the grease ring with new grease and it worked fine. So to answer the question you asked, you need to do a vacuum test and see if it HOLDS vacuum.

BarryB · 10-31-2006, 06:34 PM

something else?? Are you running any type of cam??? A bigger cam takes the vacuum away. You might need to put a vacuum canister in line. Just a thought.

Draggn66 · 10-31-2006, 08:37 PM

Quote:

Originally Posted by BarryB

something else?? Are you running any type of cam??? A bigger cam takes the vacuum away. You might need to put a vacuum canister in line. Just a thought.

naw right now it's just the stock 350 with 104K on it. Thanks for the replies. I'll look into getting a vacuum tester.

10-31-2006, 03:54 PM	#1
Draggn66 Wrenchin & Sandin!!! Join Date: Aug 2006 Location: Joliet, IL. Posts: 523	Brake Booster Question.... .....I have checked the booster on my 71 by pushing the pedal down then starting the engine and the pedal goes down a bit farther. If I understand right then that means the booster is good right? My question is could it still be bad? Everything else in the brake system is new and although it stops ok the pedal is still hard. Not quite as bad as when the vacuum line is disconnected but close. Would a new booster make the pedal feel better? Looking for opinions. TIA __________________ Randy Shorewood, IL. My Favorite eBay Searches My Driver Restore Thread 1971 C10 Longbed 2005 Silverado Shortbed 2005 FXDWG Last edited by Draggn66; 10-31-2006 at 03:55 PM. Reason: spelling

10-31-2006, 04:28 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Brake Booster Question.... http://67-72chevytrucks.com/vboard/s...d.php?t=182131 Try that. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

10-31-2006, 06:33 PM	#3
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: Brake Booster Question.... Basically all a booster is. Is a big diaphragm. You can rebuild this things with only a little trouble. They are sealed by a grease ring basically and when the grease gets dry it cracks, and you lose vacuum. I have taken them apart and replaced the grease ring with new grease and it worked fine. So to answer the question you asked, you need to do a vacuum test and see if it HOLDS vacuum.

10-31-2006, 06:34 PM	#4
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: Brake Booster Question.... something else?? Are you running any type of cam??? A bigger cam takes the vacuum away. You might need to put a vacuum canister in line. Just a thought.



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