Questions---Master cylinder and rotors - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 11-21-2006, 08:20 AM

First question- when you install brand new rotors do you have to resurface the face of the rotor before installing?. I'm thinking it's not necessary.

Second question- I picked up my master cylinder last night for a 71' C/10 and want to make sure this is correct. Mine is the one with the gold cap but I have also seen people on here with the one that has the silver cap. Will the one they gave me work???

Thanks!

underdog8704 · 11-21-2006, 08:36 AM

i have a 71 with the same cap. i have recently been looking for a gasket for the cap with no luck. the only ones i can find are in the gold cap's shape.

70c10 · 11-21-2006, 08:37 AM

Does your 71' have the style in the pic on the left or right?

byrd · 11-21-2006, 10:03 AM

Jim,
I would not resuface the rotors should be striaght anyway, a good cleaning with BPC should be just fine.
my booster and master combo that I have for my 69 has the same master as the one on the left.

cdowns · 11-21-2006, 10:08 AM

i like to gently block sand new rotors with 220 sandpaoer and then clean with brake clean

msgross · 11-21-2006, 10:43 AM

Quote:

Originally Posted by cdowns

i like to gently block sand new rotors with 220 sandpaoer and then clean with brake clean

ditto, be sure to put that "anti-squeal" stuff on the back of your pads too! Less vibrations that cause squealing....

Zonaman · 11-21-2006, 11:38 AM

Just converted my 69 to front disc brakes. Used brake cleaner for the new rotors, that's all. While we're at it, is the booster (1/2 ton) for drum the same as disc? Look the same to me. I know the proportioning valve is different.

70c10 · 11-21-2006, 02:16 PM

Thanks for the replies guys!

underdog8704 · 11-21-2006, 02:29 PM

i have the one with the silver cap. it is supposedly original. the gasket needs replaced due to some leaking, but i cant find a new one. where did you get your master cylinder from.

70c10 · 11-21-2006, 03:22 PM

I got mine at Autozone.

Longhorn Man · 11-21-2006, 03:54 PM

It is a very good idea to roughen up the rotors, we take diegrinders and hit both sides of the rotor, just a scuffing, not actually to remove a lot of material. The indy car teams all do this, it helps to bed the pads in quicker and better stopping is the result.
As for your master cylinder, are both resivours the same size? I'm willing to bet the one you have is original to the truck...when it had drums. Disk brake masters should have a much larger resivour for the front brakes since the calipers uses fluid to adjust the brakes.

Draggn66 · 11-21-2006, 06:15 PM

Quote:

Originally Posted by Longhorn Man

Disk brake masters should have a much larger resivour for the front brakes since the calipers uses fluid to adjust the brakes.

Sooo what would the symptoms be if the wrong MS was installed? My 71 has disc brakes. The MS that was on there when I got it was like the one on the right. When I replaced it with one I bought at Napa they gave me the one on the left.

**Boog** · 11-21-2006, 08:51 PM

There are many varied opinions on new rotors and drums. I feel like a brand new part should be ready to install right out of the box. Several guys have told me they never put one on without trueing it on the grinder first. I have put on a few new rotors and drums. I ended up having to have them cut to get the pulsing pedal out of it. These were bought from CarPro and Napa stores. And they were Chinese. Maybe a new genuine GM rotor or drum is true right out of the box, I don't know.
At the very least maybe you should mount them and put a dial indicator up against them to check the runout before putting it all back together.

70GMCer · 11-21-2006, 04:07 PM

Jim call me up today.....Don't do anything to those rotors!!

A.P. · 11-21-2006, 09:12 PM

For new rotors, I just clean with brake cleaner and install them. Only when replacing brake pads I resurface the rotors. Recently I replaced the MC for my 72 chevy truck and it uses the one on the right, but I could not find the original. I ended up using the one on the left. So far I had not any problems. But then again I don't use my truck as a daily driver.

A.P.

11-21-2006, 08:20 AM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Questions---Master cylinder and rotors First question- when you install brand new rotors do you have to resurface the face of the rotor before installing?. I'm thinking it's not necessary. Second question- I picked up my master cylinder last night for a 71' C/10 and want to make sure this is correct. Mine is the one with the gold cap but I have also seen people on here with the one that has the silver cap. Will the one they gave me work??? Thanks! Attached Images __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 11-21-2006 at 08:36 AM.

11-21-2006, 08:36 AM	#2
underdog8704 NCStroker Join Date: Aug 2006 Location: NC Posts: 89	Re: Questions---Master cylinder and rotors i have a 71 with the same cap. i have recently been looking for a gasket for the cap with no luck. the only ones i can find are in the gold cap's shape. __________________ 1971 Chevy C/10-Built 383 Stroker

11-21-2006, 08:37 AM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Questions---Master cylinder and rotors Does your 71' have the style in the pic on the left or right? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-21-2006, 10:08 AM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Questions---Master cylinder and rotors i like to gently block sand new rotors with 220 sandpaoer and then clean with brake clean __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

11-21-2006, 11:38 AM	#7
Zonaman Registered User Join Date: May 2004 Location: Chandler, AZ Posts: 519	Re: Questions---Master cylinder and rotors Just converted my 69 to front disc brakes. Used brake cleaner for the new rotors, that's all. While we're at it, is the booster (1/2 ton) for drum the same as disc? Look the same to me. I know the proportioning valve is different. __________________ 69 C-10 LWB, 350, 700r4, 3.73 posi-traction, front disc brakes. Built for the desert- She can take the heat! Vivat Rex Chevus!

11-21-2006, 02:16 PM	#8
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Questions---Master cylinder and rotors Thanks for the replies guys! __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-21-2006, 02:29 PM	#9
underdog8704 NCStroker Join Date: Aug 2006 Location: NC Posts: 89	Re: Questions---Master cylinder and rotors i have the one with the silver cap. it is supposedly original. the gasket needs replaced due to some leaking, but i cant find a new one. where did you get your master cylinder from. __________________ 1971 Chevy C/10-Built 383 Stroker

11-21-2006, 03:22 PM	#10
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Questions---Master cylinder and rotors I got mine at Autozone. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-21-2006, 03:54 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Questions---Master cylinder and rotors It is a very good idea to roughen up the rotors, we take diegrinders and hit both sides of the rotor, just a scuffing, not actually to remove a lot of material. The indy car teams all do this, it helps to bed the pads in quicker and better stopping is the result. As for your master cylinder, are both resivours the same size? I'm willing to bet the one you have is original to the truck...when it had drums. Disk brake masters should have a much larger resivour for the front brakes since the calipers uses fluid to adjust the brakes.

11-21-2006, 08:51 PM	#13
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: Questions---Master cylinder and rotors There are many varied opinions on new rotors and drums. I feel like a brand new part should be ready to install right out of the box. Several guys have told me they never put one on without trueing it on the grinder first. I have put on a few new rotors and drums. I ended up having to have them cut to get the pulsing pedal out of it. These were bought from CarPro and Napa stores. And they were Chinese. Maybe a new genuine GM rotor or drum is true right out of the box, I don't know. At the very least maybe you should mount them and put a dial indicator up against them to check the runout before putting it all back together. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-21-2006, 04:07 PM	#14
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Questions---Master cylinder and rotors Jim call me up today.....Don't do anything to those rotors!! __________________ 1997 GMC Sierra Ext 1965 Mustang

11-21-2006, 09:12 PM	#15
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Re: Questions---Master cylinder and rotors For new rotors, I just clean with brake cleaner and install them. Only when replacing brake pads I resurface the rotors. Recently I replaced the MC for my 72 chevy truck and it uses the one on the right, but I could not find the original. I ended up using the one on the left. So far I had not any problems. But then again I don't use my truck as a daily driver. A.P.



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