Where to find a manual mc. 71 chevy c20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

treveiger · 07-17-2013, 01:36 PM

Im trying to find a manual mc for a c20 but am having trouble. I bought what I thought was a correct mc but the part where the push rod goes into the mc is to shallow. I called summit and he said that the shallow one is for manual brakes not power but yet Im told the deeper mc is correct for manual brakes. Can anybody shed light on this? And if I need a mc for non power breaks where can I find one?
Thanks

Shyguy · 07-17-2013, 05:02 PM

Have you tried local parts stores, that is where we get a lot of parts for our old trucks.

treveiger · 07-17-2013, 05:16 PM

Ya they all have set ups for power brakes. I'd rather not have power brakes but idk if I have a choice...
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GASoline71 · 07-17-2013, 06:18 PM

Hmm... since 1971 was the first year for power front disc brakes, I wonder if no trucks were offered with a manual master cylinder.

Maybe one from a 1969 or a 1970 would work?

Gary

**Already Gone** · 07-17-2013, 10:16 PM

I have seen and I'm not sure if the truck was a 72 or 71 manual brakes. The discs were standard in 71-72 but Power Brakes were still an option you had to pay for. In the late 80's I bought a 68 Barracuda Formula S model that had the factory 383 and 4 speed manual. The car was original and had front manual disc brakes. A little research showed that in order to get the 383 in the Barracuda you had to order the front disc brakes but power brakes were an option. I remember driving that beast and even with the discs up front and because of that heavy 383 you really had to push on the pedal to get it to stop in a hurry.
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mgchevyparts · 07-17-2013, 10:26 PM

I would use a 67-78 Corvette manual master, 1" bore. RAYBESTOS MC36367

Lee H · 07-17-2013, 10:42 PM

C20 and above brake parts are rarity at auto parts box stores. I'd be calling Wes at classic heartbeat or GMCPaul.
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**70cst** · 07-17-2013, 10:44 PM

Quote:

Originally Posted by Lee H

C20 and above brake parts are rarity at auto parts box stores. I'd be calling Wes at classic heartbeat or GMCPaul.
Posted via Mobile Device

treveiger · 07-17-2013, 11:48 PM

So power brakes seem the way to go for a set up. What is all required to switch to power brakes?
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Skips · 07-18-2013, 11:29 AM

A vacuum source, the booster, the 1 way valve hose coming off of the booster, and ambition.

**GMCPaul** · 07-18-2013, 11:59 AM

Quote:

Originally Posted by treveiger

Im trying to find a manual mc for a c20 but am having trouble. I bought what I thought was a correct mc but the part where the push rod goes into the mc is to shallow. I called summit and he said that the shallow one is for manual brakes not power but yet Im told the deeper mc is correct for manual brakes. Can anybody shed light on this? And if I need a mc for non power breaks where can I find one?
Thanks

RockAuto.com running a close out special on them for 6.55ea
http://www.rockauto.com/catalog/x,ca...,parttype,1836

EIS Part # RE77008
Master Cylinder (Remanufactured); 1/2 TON,1 1/8" - MANUAL BRAKE EQPD [Wholesaler Closeout -- 30 Day Warranty] (Only 2 Remaining)

$6.55
Paul @ GMCPauls

tony58 · 07-18-2013, 12:55 PM

ALL disc brake C20's came with power, all disc brake C10's came with power until 1974 when manual became available

ALL C20 power disc brakes used a 1 1/4" master due to larger caliper piston diameter.
All C10 power disc brakes used a 1 1/8" master while the manual versions, 74 and above used 1" bore master.

If you have the large bore C20 calipers you might try a 1 1/8" bore manual master but it may be too hard which I would use a 1" bore for manual.

treveiger · 07-18-2013, 04:15 PM

Thank you guys all for your help. I decided to order a remane booster and mc for the truck. Hopefully this goes smoother lol.
Posted via Mobile Device

07-17-2013, 01:36 PM	#1
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,093	Where to find a manual mc. 71 chevy c20 Im trying to find a manual mc for a c20 but am having trouble. I bought what I thought was a correct mc but the part where the push rod goes into the mc is to shallow. I called summit and he said that the shallow one is for manual brakes not power but yet Im told the deeper mc is correct for manual brakes. Can anybody shed light on this? And if I need a mc for non power breaks where can I find one? Thanks __________________ 1969 Chevy c20(Miss Hackjob)

07-17-2013, 05:02 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Where to find a manual mc. 71 chevy c20 Have you tried local parts stores, that is where we get a lot of parts for our old trucks. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

07-17-2013, 05:16 PM	#3
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,093	Re: Where to find a manual mc. 71 chevy c20 Ya they all have set ups for power brakes. I'd rather not have power brakes but idk if I have a choice... Posted via Mobile Device __________________ 1969 Chevy c20(Miss Hackjob)

07-17-2013, 10:16 PM	#5
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: Where to find a manual mc. 71 chevy c20 I have seen and I'm not sure if the truck was a 72 or 71 manual brakes. The discs were standard in 71-72 but Power Brakes were still an option you had to pay for. In the late 80's I bought a 68 Barracuda Formula S model that had the factory 383 and 4 speed manual. The car was original and had front manual disc brakes. A little research showed that in order to get the 383 in the Barracuda you had to order the front disc brakes but power brakes were an option. I remember driving that beast and even with the discs up front and because of that heavy 383 you really had to push on the pedal to get it to stop in a hurry. Posted via Mobile Device __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

07-17-2013, 10:26 PM	#6
mgchevyparts Registered User Join Date: Feb 2013 Location: Upland, Calif Posts: 698	Re: Where to find a manual mc. 71 chevy c20 I would use a 67-78 Corvette manual master, 1" bore. RAYBESTOS MC36367 __________________ 1957 CHEVY 1/2 TON SHORT BED 1940 FORD 1/2 TON SHORT BED

07-17-2013, 10:42 PM	#7
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Where to find a manual mc. 71 chevy c20 C20 and above brake parts are rarity at auto parts box stores. I'd be calling Wes at classic heartbeat or GMCPaul. Posted via Mobile Device __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

07-17-2013, 11:48 PM	#9
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,093	Re: Where to find a manual mc. 71 chevy c20 So power brakes seem the way to go for a set up. What is all required to switch to power brakes? Posted via Mobile Device __________________ 1969 Chevy c20(Miss Hackjob)

07-18-2013, 11:29 AM	#10
Skips Registered User Join Date: Jul 2013 Location: Rochester, NY Posts: 19	Re: Where to find a manual mc. 71 chevy c20 A vacuum source, the booster, the 1 way valve hose coming off of the booster, and ambition.

07-18-2013, 12:55 PM	#12
tony58 Registered User Join Date: Feb 2013 Location: Orange, Calif Posts: 183	Re: Where to find a manual mc. 71 chevy c20 ALL disc brake C20's came with power, all disc brake C10's came with power until 1974 when manual became available ALL C20 power disc brakes used a 1 1/4" master due to larger caliper piston diameter. All C10 power disc brakes used a 1 1/8" master while the manual versions, 74 and above used 1" bore master. If you have the large bore C20 calipers you might try a 1 1/8" bore manual master but it may be too hard which I would use a 1" bore for manual.

07-18-2013, 04:15 PM	#13
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,093	Re: Where to find a manual mc. 71 chevy c20 Thank you guys all for your help. I decided to order a remane booster and mc for the truck. Hopefully this goes smoother lol. Posted via Mobile Device __________________ 1969 Chevy c20(Miss Hackjob)

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