difference between a ..... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BUXMAN66 · 01-30-2004, 05:35 AM

pwr. disc brake booster w/it's bracket and master cylinder, and a pwr. DRUM brake booster and it's bracket and master cylinder? do the holes all line up on the firewall between the two? and lastly,... is it possible to put pwr.to the drum brakes and still use the non-pwr. brake lines? any info. on this subject is appreciated!

68 Suburban · 01-30-2004, 05:41 AM

Quote:

Originally posted by BUXMAN66
pwr. disc brake booster w/it's bracket and master cylinder, and a pwr. DRUM brake booster and it's bracket and master cylinder? do the holes all line up on the firewall between the two? and lastly,... is it possible to put pwr.to the drum brakes and still use the non-pwr. brake lines? any info. on this subject is appreciated!

I think you just need to unclip the lines from the frame and move them out a little to make room for the booster. Otherwise, the same lines should be fine.

**CPNE** · 01-30-2004, 10:50 AM

Quote:

Originally posted by BUXMAN66
...do the holes all line up on the firewall between the two? ...

Yes

BUXMAN66 · 01-31-2004, 04:03 AM

thanks both to cpne and 68suburban!

BUXMAN66 · 01-31-2004, 04:06 AM

forgot to ask also......is there a diff. between a pwr.disc brake booster and a pwr. drum brake booster? in other words can i use a disc booster for my drums,and make it power drum brakes... can the wheel cylinder handle the added pressure? can't remember if there is a specific difference between the 2 wheel cylinders.

BUXMAN66 · 01-31-2004, 06:38 PM

Quote:

Originally posted by BUXMAN66
in other words can i use a disc booster for my drums,and make it power drum brakes... can the wheel cylinder handle the added pressure?

anyone?

jmanz69 · 01-31-2004, 06:55 PM

The booster shouldn't matter, it's the master cylinder that is different. You can't use a disc master cylinder on a drum setup and visa versa. The wheel cylinders should be the same. They will handle the power assist no problem.

BUXMAN66 · 01-31-2004, 10:08 PM

how about putting my master cylinder from my present drum set-up,onto the disc's power booster?there's a pwr. disc brake booster/master cyl. on e-bay just wondering if i can make it work on mine.

Rod · 01-31-2004, 10:55 PM

The main difference is in the proportining valve in the drum or disc application. Pretty much you could get away with either master cylinder on a drum or disc booster.

Use the right proportioning application valve though.

Hooter · 01-31-2004, 11:21 PM

the boosters are exactly the same

BUXMAN66 · 02-01-2004, 07:00 PM

thanks for the info. rod,hooter! i'll be looking for a pwr.drum brake prop. valve then!

jmanz69 · 02-01-2004, 07:57 PM

The drum setup doesn't have a prop valve. If you have manual brakes, you can use your valve. It's a combo valve only. Not pressure difference from front to rear. I did it on mine when I just added a booster. I had manual drums, and added a booster. No changes necessary.

BUXMAN66 · 02-02-2004, 12:51 AM

Quote:

Originally posted by jmanz69
. If you have manual brakes, you can use your valve. It's a combo valve only. Not pressure difference from front to rear. I did it on mine when I just added a booster. I had manual drums, and added a booster.

i can use my valve....? what, the one on the new(to be) booster assembly?and what necessarily is a combo valve? sorry just need some clarification here! p.s. and why is it you cant run a pwr. disc master cylinder on a pwr. drum set-up? (from previous post)

fast14 · 02-02-2004, 01:30 AM

So what would happen if you switched from drums to discs without using the proportioning valve but just changing the master cylinder??

Hooter · 02-02-2004, 02:06 AM

the front and bacl brakes could lock up at different times, or the front brakes could lock up right away and th back ones could not even inguage, I would not try it at all, you are just asking for a serious accident

01-30-2004, 05:35 AM	#1
BUXMAN66 go bucks! Join Date: Jan 2002 Location: MIAMISBURG OHIO USA Posts: 803	difference between a ..... pwr. disc brake booster w/it's bracket and master cylinder, and a pwr. DRUM brake booster and it's bracket and master cylinder? do the holes all line up on the firewall between the two? and lastly,... is it possible to put pwr.to the drum brakes and still use the non-pwr. brake lines? any info. on this subject is appreciated! __________________ '68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know?

01-31-2004, 04:03 AM	#4
BUXMAN66 go bucks! Join Date: Jan 2002 Location: MIAMISBURG OHIO USA Posts: 803	thanks both to cpne and 68suburban! __________________ '68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know?

01-31-2004, 04:06 AM	#5
BUXMAN66 go bucks! Join Date: Jan 2002 Location: MIAMISBURG OHIO USA Posts: 803	forgot to ask also......is there a diff. between a pwr.disc brake booster and a pwr. drum brake booster? in other words can i use a disc booster for my drums,and make it power drum brakes... can the wheel cylinder handle the added pressure? can't remember if there is a specific difference between the 2 wheel cylinders. __________________ '68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know? Last edited by BUXMAN66; 01-31-2004 at 04:08 AM.

01-31-2004, 10:08 PM	#8
BUXMAN66 go bucks! Join Date: Jan 2002 Location: MIAMISBURG OHIO USA Posts: 803	how about putting my master cylinder from my present drum set-up,onto the disc's power booster?there's a pwr. disc brake booster/master cyl. on e-bay just wondering if i can make it work on mine. __________________ '68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know?

01-31-2004, 10:55 PM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	The main difference is in the proportining valve in the drum or disc application. Pretty much you could get away with either master cylinder on a drum or disc booster. Use the right proportioning application valve though. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-31-2004, 06:55 PM	#7
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	The booster shouldn't matter, it's the master cylinder that is different. You can't use a disc master cylinder on a drum setup and visa versa. The wheel cylinders should be the same. They will handle the power assist no problem.

01-31-2004, 11:21 PM	#10
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	the boosters are exactly the same __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

02-01-2004, 07:00 PM	#11
BUXMAN66 go bucks! Join Date: Jan 2002 Location: MIAMISBURG OHIO USA Posts: 803	thanks for the info. rod,hooter! i'll be looking for a pwr.drum brake prop. valve then! __________________ '68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know?

02-01-2004, 07:57 PM	#12
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	The drum setup doesn't have a prop valve. If you have manual brakes, you can use your valve. It's a combo valve only. Not pressure difference from front to rear. I did it on mine when I just added a booster. I had manual drums, and added a booster. No changes necessary.

02-02-2004, 01:30 AM	#14
fast14 Registered User Join Date: Nov 2003 Posts: 117	So what would happen if you switched from drums to discs without using the proportioning valve but just changing the master cylinder?? __________________ Just a little crazy 1970 chevy full size half ton, soon to be one ton running gear, 350 turbo, 205 case, 355c.i.

02-02-2004, 02:06 AM	#15
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	the front and bacl brakes could lock up at different times, or the front brakes could lock up right away and th back ones could not even inguage, I would not try it at all, you are just asking for a serious accident __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

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