What master cylinder is this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brap999 · 03-28-2011, 04:23 PM

Hello, there is a late model master cylinder in my '63 c10. The previous owner has the cap tied and taped down, I'm guessing because it doesn't stay on so well anymore.

I wanted to replace it, but I'm not 100% what it is out of. Looking around it appears it may be an 80s - early 90's master cylinder from a GM truck. However there are two bolts with blue tips that extend out from the bottom driver side. I have no idea what these are for, and are not used on my truck. The replacement master cylinders do not have these.

onequickchevy · 03-28-2011, 05:05 PM

Not sure, but it looks like a M/C off of a later model with ABS. I used the M/C model off of the donor truck I used, an 83 chevrolet c10. Should bolt in the same place, might have to use an adapter on the brake lines though.

brap999 · 03-28-2011, 07:30 PM

That makes sense, that those blue tipped bolt things would be for ABS, don't know why I didn't think of that.

I guess I'll get one of the late 80's M/C, near as I can tell they are nearly the same as what I have, but with out those blue tipped things.

Thanks for your help!

onequickchevy · 03-28-2011, 07:45 PM

Anytime, thats why we all spend so much time here!

Big Fenders · 03-28-2011, 09:28 PM

I could be wrong but I think the blue tipped things are call residual valves...used to adjust brake pressure.
Bob

**Captainfab** · 03-29-2011, 01:01 AM

Yes I would guess that is a late 80's early 90's master cylinder. It is quite possible that those brake lines are metric. In which case if you change to an earlier master cylinder those will need to be changed.

Assuming you have a disc/drum braking system. I would recomend getting a master from a '71-early 80's truck. You will also need to make sure you have the correct proportioning valve.

stsalvage · 04-03-2011, 04:25 AM

Not to step on any one toes best brake kit you can buy for the money is the booster and master cylinder from auto Zone it comes as both of them bolted together for 139.00 lifetime warranty it might of gone up to 159.00 with core charge Best off find some one on here with the Portion valve and get the rear brake leavers and i have pictures of what i did on my 1972 and my 1965 3/4 ton

stsalvage · 04-03-2011, 04:27 AM

a few more pictures

03-28-2011, 04:23 PM	#1
brap999 Registered User Join Date: Mar 2011 Location: Springfield, VA Posts: 223	What master cylinder is this? Hello, there is a late model master cylinder in my '63 c10. The previous owner has the cap tied and taped down, I'm guessing because it doesn't stay on so well anymore. I wanted to replace it, but I'm not 100% what it is out of. Looking around it appears it may be an 80s - early 90's master cylinder from a GM truck. However there are two bolts with blue tips that extend out from the bottom driver side. I have no idea what these are for, and are not used on my truck. The replacement master cylinders do not have these.

03-28-2011, 05:05 PM	#2
onequickchevy Registered User Join Date: Sep 2009 Location: Marianna, Florida Posts: 339	Re: What master cylinder is this? Not sure, but it looks like a M/C off of a later model with ABS. I used the M/C model off of the donor truck I used, an 83 chevrolet c10. Should bolt in the same place, might have to use an adapter on the brake lines though. __________________ Slowly but surely getting it done.

03-28-2011, 07:30 PM	#3
brap999 Registered User Join Date: Mar 2011 Location: Springfield, VA Posts: 223	Re: What master cylinder is this? That makes sense, that those blue tipped bolt things would be for ABS, don't know why I didn't think of that. I guess I'll get one of the late 80's M/C, near as I can tell they are nearly the same as what I have, but with out those blue tipped things. Thanks for your help!

03-28-2011, 07:45 PM	#4
onequickchevy Registered User Join Date: Sep 2009 Location: Marianna, Florida Posts: 339	Re: What master cylinder is this? Anytime, thats why we all spend so much time here! __________________ Slowly but surely getting it done.

03-28-2011, 09:28 PM	#5
Big Fenders Registered User Join Date: Mar 2008 Location: Tucson Arizona Posts: 264	Re: What master cylinder is this? I could be wrong but I think the blue tipped things are call residual valves...used to adjust brake pressure. Bob

03-29-2011, 01:01 AM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,251	Re: What master cylinder is this? Yes I would guess that is a late 80's early 90's master cylinder. It is quite possible that those brake lines are metric. In which case if you change to an earlier master cylinder those will need to be changed. Assuming you have a disc/drum braking system. I would recomend getting a master from a '71-early 80's truck. You will also need to make sure you have the correct proportioning valve. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

04-03-2011, 04:25 AM	#7
stsalvage Scrapper 1 Join Date: Jan 2007 Location: Riverside Calif Posts: 1,649	Re: What master cylinder is this? Not to step on any one toes best brake kit you can buy for the money is the booster and master cylinder from auto Zone it comes as both of them bolted together for 139.00 lifetime warranty it might of gone up to 159.00 with core charge Best off find some one on here with the Portion valve and get the rear brake leavers and i have pictures of what i did on my 1972 and my 1965 3/4 ton Attached Images

04-03-2011, 04:27 AM	#8
stsalvage Scrapper 1 Join Date: Jan 2007 Location: Riverside Calif Posts: 1,649	Re: What master cylinder is this? a few more pictures Attached Images



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