need help with brake booster measurement - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jamis · 03-20-2006, 06:23 PM

Hey guys, I’m about to go ballistic
I cant figure out which piece is wrong, is the brake booster the wrong one or are these brackets too short. I think its the brackets. I figure the correct ones should be about 5" long
Of coarse keeping with my history of being a retard I didn’t bother fitting the parts till after all the prep and paintwork was done.
Ohhhhh I forgot to mention this is a 71

**truckdude239** · 03-20-2006, 06:49 PM

best picture i could find for yal doing a google seach sorry for useing someone esles picture if its anyones on here

**uncle** · 03-20-2006, 08:30 PM

3/4 ton correct? Are those the brackets you had on it before painting?

jamis · 03-20-2006, 09:03 PM

uncle
1971 1/2 ton. That pic of all those boosters is not mine.
I don’t have the original one. That’s where my confusion is, if I have the right bracket or not.

truckdude239
Thanks for digging for that pic. What I really need is a measurement of the bracket. The one I have is 3 1/2"

**uncle** · 03-20-2006, 09:54 PM

I'll try to get you 1 tomorrow.

Lakewood90712 · 03-20-2006, 10:40 PM

This is a 11" booster from a 3/4 ton , the bracket is 5 and 1/8 inches. Puts the master cyl pointing slightly down.
John

jamis · 03-20-2006, 10:44 PM

Thanks John

Does anyone with a 1/2 ton get the same measurement as John?

I went to a diffrent parts store just to check if the booster was wrong ...... looked at one from a diffrent rebuilder and it was the same as mine.

I know there are delco and bendix boosters but I was told it only effects the master cyl. In other words a delco master must be used with a delco booster.

big blue 72 · 03-20-2006, 10:51 PM

glad I'm not the only one having problems with the brake booster.
hope to have mine done after this big snow storm leaves town...............
Thanks to those who responded to my Q's and helped out.

**67sss** · 03-20-2006, 11:22 PM

this on a 72 1/2t gmc I have and one on have on the shelf. close as I can tell looks to be 5 3/4" long.

Bob Moore · 03-20-2006, 11:27 PM

Jamis - Looks like you have a 3/4T booster with 1/2T brackets. I have both sets of brackets and they are about 2 inches different where you measured. As mentioned above the 3/4T brackets place the MC at a slight downward angle.

**Bob B.** · 03-21-2006, 05:32 AM

1967-70 trucks with drum brakes use Bendix boosters, and 71-72 trucks with disc brakes use Delco-Morane boosters. The brackets are different between Bendix and Delco boosters.

jamis · 03-21-2006, 12:37 PM

The mystery has been solved.
These brackets are for a 67 drum/drum booster setup.
Thanks for all your help.....

Gazoo · 03-21-2006, 10:52 PM

Nice paint job on the booster and bracket however......

03-20-2006, 06:23 PM	#1
jamis F.A.S.T. president Join Date: Sep 2003 Location: Florida Posts: 1,883	need help with brake booster measurement Hey guys, I’m about to go ballistic I cant figure out which piece is wrong, is the brake booster the wrong one or are these brackets too short. I think its the brackets. I figure the correct ones should be about 5" long Of coarse keeping with my history of being a retard I didn’t bother fitting the parts till after all the prep and paintwork was done. Ohhhhh I forgot to mention this is a 71 __________________ F.A.S.T. President and Founder Fabricators for the Advancement of Sawsall Technology "A fear of the Sawsall is a sign of retarded sexual and emotional maturity." ~Sigmund Freud, "General Introduction to Psychoanalysis" Last edited by jamis; 10-05-2007 at 07:13 AM.

03-20-2006, 06:49 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: need help with brake booster measurement best picture i could find for yal doing a google seach sorry for useing someone esles picture if its anyones on here Attached Images __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 03-20-2006 at 06:54 PM.

03-20-2006, 08:30 PM	#3
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,286	Re: need help with brake booster measurement 3/4 ton correct? Are those the brackets you had on it before painting?

03-20-2006, 09:03 PM	#4
jamis F.A.S.T. president Join Date: Sep 2003 Location: Florida Posts: 1,883	Re: need help with brake booster measurement uncle 1971 1/2 ton. That pic of all those boosters is not mine. I don’t have the original one. That’s where my confusion is, if I have the right bracket or not. truckdude239 Thanks for digging for that pic. What I really need is a measurement of the bracket. The one I have is 3 1/2" __________________ F.A.S.T. President and Founder Fabricators for the Advancement of Sawsall Technology "A fear of the Sawsall is a sign of retarded sexual and emotional maturity." ~Sigmund Freud, "General Introduction to Psychoanalysis"

03-20-2006, 09:54 PM	#5
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,286	Re: need help with brake booster measurement I'll try to get you 1 tomorrow.

03-20-2006, 10:40 PM	#6
Lakewood90712 Registered User Join Date: Jan 2006 Location: so. cal Posts: 111	Re: need help with brake booster measurement This is a 11" booster from a 3/4 ton , the bracket is 5 and 1/8 inches. Puts the master cyl pointing slightly down. John Attached Images __________________ 1987 GMC heavy half Shortwide-GONE 1971 LWB 350/350-GONE 1972 Buick Skylark (80K orig. miles,one family owned) 2002 Currie Phat Flyer (Pit Vehicle) STOLEN ..............................................

03-20-2006, 10:44 PM	#7
jamis F.A.S.T. president Join Date: Sep 2003 Location: Florida Posts: 1,883	Re: need help with brake booster measurement Thanks John Does anyone with a 1/2 ton get the same measurement as John? I went to a diffrent parts store just to check if the booster was wrong ...... looked at one from a diffrent rebuilder and it was the same as mine. I know there are delco and bendix boosters but I was told it only effects the master cyl. In other words a delco master must be used with a delco booster. __________________ F.A.S.T. President and Founder Fabricators for the Advancement of Sawsall Technology "A fear of the Sawsall is a sign of retarded sexual and emotional maturity." ~Sigmund Freud, "General Introduction to Psychoanalysis" Last edited by jamis; 03-20-2006 at 10:49 PM.

03-20-2006, 10:51 PM	#8
big blue 72 Senior Member Join Date: May 2002 Location: hamilton,ohio,usa Posts: 1,499	Re: need help with brake booster measurement glad I'm not the only one having problems with the brake booster. hope to have mine done after this big snow storm leaves town............... Thanks to those who responded to my Q's and helped out.

03-20-2006, 11:22 PM	#9
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,322	Re: need help with brake booster measurement this on a 72 1/2t gmc I have and one on have on the shelf. close as I can tell looks to be 5 3/4" long. Attached Images

03-20-2006, 11:27 PM	#10
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Re: need help with brake booster measurement Jamis - Looks like you have a 3/4T booster with 1/2T brackets. I have both sets of brackets and they are about 2 inches different where you measured. As mentioned above the 3/4T brackets place the MC at a slight downward angle. __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

03-21-2006, 05:32 AM	#11
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,321	Re: need help with brake booster measurement 1967-70 trucks with drum brakes use Bendix boosters, and 71-72 trucks with disc brakes use Delco-Morane boosters. The brackets are different between Bendix and Delco boosters. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

03-21-2006, 12:37 PM	#12
jamis F.A.S.T. president Join Date: Sep 2003 Location: Florida Posts: 1,883	Re: need help with brake booster measurement The mystery has been solved. These brackets are for a 67 drum/drum booster setup. Thanks for all your help..... __________________ F.A.S.T. President and Founder Fabricators for the Advancement of Sawsall Technology "A fear of the Sawsall is a sign of retarded sexual and emotional maturity." ~Sigmund Freud, "General Introduction to Psychoanalysis"

03-21-2006, 10:52 PM	#13
Gazoo Registered User Join Date: Aug 2005 Location: Fredericton, New Brunswick, Canada Posts: 63	Re: need help with brake booster measurement Nice paint job on the booster and bracket however...... __________________ 71 short fleetside



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