Brake booster? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sonicman · 10-20-2010, 10:17 AM

Can I just add a brake booster to my stock master cylinder or do I have to replace the MC

GMCBubba · 10-20-2010, 10:56 AM

i beleive you can just add, but the cost of the combo booster/mc units are only a couple dollars more than booster alone.

do you already have the brackets to mount to the firewall?

ERASER5 · 10-20-2010, 12:20 PM

You can, but you shouldn't. A non-power MC has a different bore size than a power MC. This can cause issues later. Look for a vacuum booster set up for 67 to 72. The mounting bracket will have a linkage setup to reset the pedal/rod ratio from non-power ratio to power ratio.

Here is a linc to Master Power Brakes. Their tech section has a lot of info.

http://www.mpbrakes.com/

Sonicman · 10-20-2010, 03:43 PM

Thanks guys. Will just get a full set up.

raycow · 10-20-2010, 09:22 PM

You can swap the MC sometimes. It all depends on the depth of the pushrod bore in the piston. Most manual cylinders have a deep bore so the pushrod won't fall out. PB cylinders can have either a deep or shallow bore, depending on the length of the booster pushrod.

Sometimes the cylinder bore size is different as ERASER5 said, but this is not always the case.

Ray

pat 70/71 · 10-20-2010, 10:56 PM

IMHO, the full setup is the way to go . start fresh that way every things new and its not that expensive. good luck, Pat

10-20-2010, 10:17 AM	#1
Sonicman Registered User Join Date: Jul 2010 Location: Denton, TX Posts: 155	Brake booster? Can I just add a brake booster to my stock master cylinder or do I have to replace the MC

10-20-2010, 10:56 AM	#2
GMCBubba Registered User Join Date: Oct 2006 Location: Simpsonville, SC Posts: 255	Re: Brake booster? i beleive you can just add, but the cost of the combo booster/mc units are only a couple dollars more than booster alone. do you already have the brackets to mount to the firewall? __________________ 1969 GMC 3/4 ton, 307, 4-speed NP435GL, DANA 60, 4.10, HD rear leafs, manual everything, leaking oil and water. Now rocking 383, NV4500, power steering, power brakes. Finally undergoing restoration.

10-20-2010, 12:20 PM	#3
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Re: Brake booster? You can, but you shouldn't. A non-power MC has a different bore size than a power MC. This can cause issues later. Look for a vacuum booster set up for 67 to 72. The mounting bracket will have a linkage setup to reset the pedal/rod ratio from non-power ratio to power ratio. Here is a linc to Master Power Brakes. Their tech section has a lot of info. http://www.mpbrakes.com/ __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60

10-20-2010, 03:43 PM	#4
Sonicman Registered User Join Date: Jul 2010 Location: Denton, TX Posts: 155	Re: Brake booster? Thanks guys. Will just get a full set up.

10-20-2010, 09:22 PM	#5
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Brake booster? You can swap the MC sometimes. It all depends on the depth of the pushrod bore in the piston. Most manual cylinders have a deep bore so the pushrod won't fall out. PB cylinders can have either a deep or shallow bore, depending on the length of the booster pushrod. Sometimes the cylinder bore size is different as ERASER5 said, but this is not always the case. Ray Last edited by raycow; 10-20-2010 at 11:04 PM.

10-20-2010, 10:56 PM	#6
pat 70/71 Registered User Join Date: Nov 2009 Location: newbury park california Posts: 1,038	Re: Brake booster? IMHO, the full setup is the way to go . start fresh that way every things new and its not that expensive. good luck, Pat



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