Engine and Power Brake Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 05-31-2004, 12:17 AM

I recently installed a booster on my 68 1/2 ton. It has drums all the way around. I noticed today that when I released the brake pedal the rpms would go down about 100 rpm for 1-2 seconds them come back up. What causes this?

Thanks

franko72 · 05-31-2004, 01:13 AM

Maybe you need to install a new check valve at the booster from your vaccuum hose.

skokie · 05-31-2004, 01:28 AM

Yep I was thinking about that to. Would a parts store carry that? Or would I need to go to a place like summit?

krue · 05-31-2004, 03:17 AM

Any parts store should have one in the HELP section.

FRENCHBLUE72 · 05-31-2004, 04:26 AM

I need to buy a new check valve is there a difference between the valve's as far as is one for 1/2 or 3/4 ton application's or can I just grab any check valve off the help section???

krue · 05-31-2004, 07:15 AM

Should be the same, a check valve is a check valve is a check valve.

05-31-2004, 12:17 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,338	Engine and Power Brake Question I recently installed a booster on my 68 1/2 ton. It has drums all the way around. I noticed today that when I released the brake pedal the rpms would go down about 100 rpm for 1-2 seconds them come back up. What causes this? Thanks

05-31-2004, 01:13 AM	#2
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	Maybe you need to install a new check valve at the booster from your vaccuum hose. __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust

05-31-2004, 03:17 AM	#4
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Any parts store should have one in the HELP section. __________________ "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"

05-31-2004, 04:26 AM	#5
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	I need to buy a new check valve is there a difference between the valve's as far as is one for 1/2 or 3/4 ton application's or can I just grab any check valve off the help section??? __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

05-31-2004, 07:15 AM	#6
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Should be the same, a check valve is a check valve is a check valve. __________________ "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"

05-31-2004, 01:28 AM	#3
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,338	Yep I was thinking about that to. Would a parts store carry that? Or would I need to go to a place like summit?

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