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1958-64 Chevy Full-size Car Brake Booster Combo, Disc/Disc, Drum/Drum

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Specs
Material Type:
Steel
Sold in Quantity:
Kit
Outlet Fitting:
Front: 1/2"-20, Rear: 9/16"-18
Overall Diameter:
8.00
Mounted Length:
14.25
Bore Size:
1.00
Notes
Proportioning valve comes with 1/8” NPT to 3/8"-24 IFF adapter fittings.
1958-64 Chevy Full-size Car Brake Booster Combo, Disc/Disc, Drum/Drum

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Details

Reviews (3)

Q & A (13)

What's in the Box

Info

When you put modern disc brakes on your 1958-1964 Chevy full-size car (Bel-Air, Biscayne, Impala, 150 Series, 210 Series), you should update the master cylinder as well. Stock 4-wheel drum master cylinders do not have the capacity to supply the proper amount of pressure for disc brakes. For best results, we recommend using this simple, bolt-on master cylinder booster kit on all 4-wheel disc brake conversions or as a power brake upgrade for 4-wheel drum brake applications.

  • 8" dual diaphragm booster
  • 1" bore master cylinder
  • Adjustable proportioning valve for rear brake line
  • Master cylinder has outlets on both sides for ease of plumbing
  • 1/2"-20 and 9/16"-18 outlets

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection.

Notes

  1. Will not fit cars equipped with the original generator-mounted power steering pump.
  2. Front drum-to-disc brake conversions also require a proportioning valve to be installed in the rear brake line circuit. The proportioning valve modulates pressure to the rear brakes which is necessary to prevent the rear brakes from locking up in an emergency stop situation. This kit incudes an adjustable proportioning valve to allow for a proper installation of front disc brakes.

Customer Reviews

Rated 4 out of 5 by 3 reviewers.
RATING BREAKDOWN
3 reviews
5 Stars
1
4 Stars
1
3 Stars
1
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

NegativeNancy
Verified Purchaser

Bolted right in!

April 22, 2014
This was one of those times when an aftermarket purchase fit like it should.
Pros:
  • fit & function
Yes, I recommend this product.
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Chatas55
Verified Purchaser
Houston, Texas

Great Product

April 20, 2013
The photo shows this product assemble however it arrived unassembled. I bought it because it show it assembled and that was my sole reason why I bought it.
Yes, I recommend this product.
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HotRod 55
Verified Purchaser
Nashville TN

Super Easy Install or upgrade

April 17, 2011
Very nice upgrade i think for the money
Pros:
  • Can Withstand Use
Yes, I recommend this product.
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Was this review helpful? 0 0

Page 1 of 1

Product Q&A

13 questions : 15 answers

1 answers

Choice between 2 power brake booster/master cylinder systems I have a 1962 Impala with drum brakes all around and want to replace the power booster and upgrade the master cylinder for a possible front disc conversion in the future. I am considering the 91031974 or the 91035864. They seem similar except for the adjustable proportioning valve in the 1974 unit vs. the GM style in the 5864. Would either one be suitable for my needs? I would appreciate any additional information as well as a recommendation. Thanks.

Rcarocky
Iowa, USA
May 16, 2014

Choice between 2 power brake booster/master cylinder systems I have a 1962 Impala with drum brakes all around and want to replace the power booster and upgrade the master cylinder for a possible front disc conversion in the future. I am considering the 91031974 or the 91035864. They seem similar except for the adjustable proportioning valve in the 1974 unit vs. the GM style in the 5864. Would either one be suitable for my needs? I would appreciate any additional information as well as a recommendation. Thanks.

Answers

May 19, 2014
Travisp
Both of these kits will work fine for you. 91035864 will use a stock type gm style proportioning valve and part # 91031974 would use a after market proportioning valve. I like the after market valve because it is not preset and you can adjust yourself.
1 answers

fitment on a Pontiac 1959 Pontiac star chief- drum / drum. will this booster fit and work with minor if any modifications?

Jdw1004
Cape Coral, FL, USA
February 04, 2014

fitment on a Pontiac 1959 Pontiac star chief- drum / drum. will this booster fit and work with minor if any modifications?

Answers

February 04, 2014
EricM
Master cylinder and booster number 91031974 is designed for the Chevy and fit to the Pontiac cannot be verified. The mount holes on the brackets are 3 3/8" center to center horizontally and 2 ½" vertically and are slotted for some variations and adjustment up and down. We apologize we do not have an exact replacement for your Pontiac but check the measurements against yours to see if modification or alteration is required.
2 answers

whats the differents between this one 910331974 and 91035556

greyghost
Harker Heights, TX, USA
May 20, 2013

whats the differents between this one 910331974 and 91035556

Answers

July 02, 2015
Eric
Expert
Part number 91031974 has angled mounting brackets and angles the booster and master cylinder up at an angle for additional engine clearance. This kit is for disc/disc or 4 wheel drum. It may require drilling another hole in the brake pedal for proper alignment to the booster. It also comes with an adjustable proportioning valve to dial in proper brakeing. 91035556 is for a disc/drum application and the brackets for mounting keep the booster and master parallel to the ground. This kit comes with the metering valve for proper braking. This kit is 14 ¼" from firewall to end of master to check your clearance to the back of your power steering and generator combo.
May 21, 2013
Jason
Part number 91031974 has angled mounting brackets and angles the booster and master cylinder up at an angle for additional engine clearance. This kit is for disc/disc or 4 wheel drum. It may require drilling another hole in the brake pedal for proper alignment to the booster. It also comes with an adjustable proportioning valve to dial in proper brakeing. 91035556 is for a disc/drum application and the brackets for mounting keep the booster and master parallel to the ground. This kit comes with the metering valve for proper braking. This kit is 14 ¼” from firewall to end of master to check your clearance to the back of your power steering and generator combo.
1 answers

Will this 1955-64 combo work with my power brakes drum/drum? My 1959 Impala came with power brakes. I did a complete overhaul to my brakes, wheel cylinders, brake lines all original drum/drum. I now need to replace my old power booster/master cylinder combo. Questions; 1. Will this unit work with my original equipment. 2. What else do I have to get to make this a mount ready to go unit. Thanks, Richard.

Chata
Texas
March 29, 2013

Will this 1955-64 combo work with my power brakes drum/drum? My 1959 Impala came with power brakes. I did a complete overhaul to my brakes, wheel cylinders, brake lines all original drum/drum. I now need to replace my old power booster/master cylinder combo. Questions; 1. Will this unit work with my original equipment. 2. What else do I have to get to make this a mount ready to go unit. Thanks, Richard.

Answers

April 01, 2013
Jason
This kit number 91031974 is designed for conversion to power brakes when going with disc brake conversions in the front. It will work fine with four wheel drum and we have that choice when ordering. The 1 inch bore master would be correct for that application. Mounting the unit to your existing booster brackets will not work and either you can eliminate your existing mounting brackets and hardware and use the complete assembly or fabricate or modify your existing booster bracket to accept the 3 3/8” center to center square pattern of the included booster.
1 answers

will this work with 1961 chevrolet belair, drum front & drum rear

January 18, 2012

will this work with 1961 chevrolet belair, drum front & drum rear

Answers

January 19, 2012
John
Part number 91031974 This master cylinder/booster combo is designed for 4 wheel disc or 4 wheel drum applications. If currently having just a master cylinder you will need to accommodate the booster bracket 4 bolt mounting and reinforcement may be required on the inside of the firewall.
1 answers

I need a brake booster fora 1964 chevy C-10 with 4-wheel drum brakes and the necessary hard ware. Will this brake booster work for me? If not what do I need? Dave

Lumber Bridge, NC
August 31, 2011

I need a brake booster fora 1964 chevy C-10 with 4-wheel drum brakes and the necessary hard ware. Will this brake booster work for me? If not what do I need? Dave

Answers

August 31, 2011
John
This kit is for the full size passenger car vehicles. We do offer a direct kit for the 63-66 Chevy pickups under part number 93063660 and set up for the four wheel drum applications.
1 answers

could you tell me which adapters (part numbers) i need to use on this master cylinder to enable me to use part number 91031800 (3/16 brake lines with 3/8" x 24 fittings). thanks!

handyman7
nashville, tn
February 15, 2012

could you tell me which adapters (part numbers) i need to use on this master cylinder to enable me to use part number 91031800 (3/16 brake lines with 3/8" x 24 fittings). thanks!

Answers

February 16, 2012
Jason
You will need part #9103183-1/2 and 9103183-9/16. Master cylinder has one port 1/2-20 and other is 9/16-18
2 answers

What is the diameter of the booster? Will it work on a disk front / drum rear combo?

January 21, 2011

What is the diameter of the booster? Will it work on a disk front / drum rear combo?

Answers

January 25, 2011
John W
This is an 8” dual diaphragm booster and 1” bore master cylinder and should work fine with disc/drum brake applications.
April 19, 2011
HotRod 55
very compact maybe 12 inch around we put small block motor in down beside it with no problem in a 55 and it comes with a proportioning valve for the rear drums..
1 answers

what is the difference between 91031974 and 91031415

mark
omaha ne
December 31, 2010

what is the difference between 91031974 and 91031415

Answers

January 04, 2011
Clark
Simply stated, the 910-31415 is the “OLD” way, the 910 31974 is the “NEW” way. The 910-31974 costs less than 910-31415 ($209.99 vs $249.99). Further, the 910-31974 comes with an adjustable proportioning valve, the 910-31415 does not. The 910-31974 kit is definitely the way to go.
1 answers

was wondering if a duel mastercylendar that not [powered would work wondering if you can used a duel cylinder that is not powered brakes with the 55 chevy speedway disk brake kit

john55
pa
April 12, 2015

was wondering if a duel mastercylendar that not [powered would work wondering if you can used a duel cylinder that is not powered brakes with the 55 chevy speedway disk brake kit

Answers

April 14, 2015
EricM
A lot of our customers are using a dual reservoir master cylinder without a booster on their street rods and get by fine as long as their pedal ratio is sufficient. Pedal ratio for a manual brake setup should be in the neighborhood of 6.5 to 1 or higher. You will still need the proportioning valve to fine tune the bias front to rear between the front discs and rear drums.
Page 1 of 2

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