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Dual Diaphragm 7 Inch Stainless Brake Booster

SAME DAY SHIPPING! Order within the next 2 hours 5 minutes and receive same day shipping

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Specs
Sold in Quantity:
Each
Finish:
Polished
Material Type:
Stainless Steel
Bolt Hole Pattern:
3.38" x 3.38"
Centerline of Holes:
3.38
Overall Thickness:
5.00
Outside Diameter:
7.00
Rod Length:
4.00
Notes
Dual diaphragm booster. Pushrod is 3/8" fine thread.
Dual Diaphragm 7 Inch Stainless Brake Booster
Dual Diaphragm 7 Inch Stainless Brake Booster
Dual Diaphragm 7 Inch Stainless Brake Booster

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Details

Reviews (5)

Q & A (6)

What's in the Box

Info

These show-quality polished stainless steel 7" boosters feature a dual diaphragm housing for use with heavier cars or pickups. Accepts most power brake master cylinders.

  • Pushrod stud is 3/8" fine thread
  • Master cylinder studs are two 3/8" coarse studs across from each other on 3-3/8" centers
  • Booster is 5" thick

Booster Tech Tip (GIF)

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

Application

  • 5" thick from master cylinder mount face to firewall mount face
  • 4" long firewall mount face to end of pushrod
  • Four stud pattern is square pattern with 3-3/8" stud centers
  • Pushrod stud is 3/8" fine thread
  • Master cylinder studs are two studs across from each other on 3-3/8" centers

Specs

  • 5" thick from master cylinder mount face to firewall mount face
  • 4" long firewall mount face to end of pushrod
  • Four stud pattern is square pattern with 3-3/8" stud centers
  • Pushrod stud is 3/8" fine thread
  • Master cylinder studs are two studs across from each other on 3-3/8" centers

Customer Reviews

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

Robo
Verified Purchaser
Dallas, TX

Exactly what I needed and quick ship time, good job!!

December 21, 2015
Replaced an old unit that was painted black. This chrome part looks so much better and works good too.
Yes, I recommend this product.
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Danny
Verified Purchaser
Verified Reviewer
Orlando, Fla

Great

October 30, 2015
Good products! Great service & communications !! Great delivery.
Pros:
  • Excellent Service Commu
Yes, I recommend this product.
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Stanley57
Verified Purchaser
Oxnard, CA, USA

the stainless look as good chrome.

March 22, 2015
The dual diaphragm 7 inch stainless brake booster fit perfect for my car. No more hard brake petal. The car now stop with little effort when I applied the brake. I'm very please on dual diaphragm 7 inch brake booster overall performance. Thank you!!!!
Yes, I recommend this product.
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Flatsmando
Verified Purchaser
Atlanta, GA, USA

Got the wrong part but it worked out bet

September 10, 2014
Ordered the wrong part for my master cylinder. Unable to locate correct booster so changed master. Very pleased with result. Good product and fast shipping. I now have a more common combination. The booster looks good too.
Yes, I recommend this product.
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Larry
Verified Purchaser
Rolla, Missouri 65401

Looks good fits

October 06, 2011
I haven`t finished the instillation but product has an excellent appearence and will look good in the engine compartment of my 1957 Chevrolet.
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

6 questions : 6 answers

1 answers

Vacume problems How much vacume does this require? I have a 1970 Mustang with a 351 Cleveland that only provides 12 " ov vacume. I would like ot install a power brake booster, but have been running into problems with the amount of vacume that is required.

ADrian
Iowa
January 16, 2013

Vacume problems How much vacume does this require? I have a 1970 Mustang with a 351 Cleveland that only provides 12 " ov vacume. I would like ot install a power brake booster, but have been running into problems with the amount of vacume that is required.

Answers

January 16, 2013
Jason
Power brake boosters require 17" of vacuum or more to function properly. Smaller boosters may require up to 22" of vacuum to function proper.
1 answers

what booster or booster kit would be best to use with a 3000 lb +or- weight car with stick shift, suspended pedals of my own design and a clearence problem for the clutch master cylinder. thanks in advance AWA

AWA
Tucson AZ
February 18, 2012

what booster or booster kit would be best to use with a 3000 lb +or- weight car with stick shift, suspended pedals of my own design and a clearence problem for the clutch master cylinder. thanks in advance AWA

Answers

February 21, 2012
John
Part number 91031460 On a 3000 plus pound car we recommend a dual diaphragm power booster. Booster requirements are 18-20 inches of vacuum to achieve full power assist. For disc/drum a 1” bore master will suffice and for four wheel disc a 1 1/8” master is recommended when used with a booster.
1 answers

I have a chassis for a 1986 Chrylser Fifth Ave, discs in front, drum in back. Will this work on my car? Thanks

September 01, 2011

I have a chassis for a 1986 Chrylser Fifth Ave, discs in front, drum in back. Will this work on my car? Thanks

Answers

September 01, 2011
Zach
As far as this brake booster being capable of functioning correctly, yes this will work. However, this is a universal brake booster. The mounting arrangement may be different than the original master cylinder and or brake booster your car may have had originally. Here are the specs to help you determine if this will work for you: 5" thick from master cylinder mount face to firewall mount face, 4" long firewall mount face to end of pushrod, Four stud pattern is square pattern with 3-3/8" stud centers, Pushrod stud is 3/8" fine thread, Master cylinder studs are two studs across from each other on 3-3/8" centers
1 answers

I have a custom built car using the master cylinder from a 87 corvette,but the builder didnt design the system with a booster.If I have the room,will this booster work with the 87 corvette MC?

Jim
Indiana
June 14, 2011

I have a custom built car using the master cylinder from a 87 corvette,but the builder didnt design the system with a booster.If I have the room,will this booster work with the 87 corvette MC?

Answers

June 16, 2011
John
This booster requires a master cylinder designed to work with a booster or a master cylinder that is a combination manual or power brake master cylinder. Difference is the piston in the master cylinder. A regular hydraulic manual booster has a deep bore in the piston visible from the rear where the push rod enters and helps keep the push rod in place. A boosted master cylinder has a slight dish in the piston where the “spud” on the booster makes contact with the piston. There is always a slight gap between the small “spud” push rod and the piston allowing the piston to return all the way when the pedal is released. The internals on the master cylinders is basically the same and the Corvette style master cylinders we offer are adaptable to either braking system. Included in the box is a dished cylinder or adapter that slides into the deep bore of the master cylinder piston changing it to a slight dish and from a manual to a power master cylinder.
1 answers

I have one of these boosters and a master cylinder with the shallow hole in the back. After doing some research I find that there should be no more than 1/32" clearance between the pushrod on the booster and the hole in the rear of the master. I have abou

Tim
Victoria B.C.
April 10, 2011

I have one of these boosters and a master cylinder with the shallow hole in the back. After doing some research I find that there should be no more than 1/32" clearance between the pushrod on the booster and the hole in the rear of the master. I have abou

Answers

April 18, 2011
Jack
The pushrod on the booster is adjustable so you should be able to adjust that to take up the clearance.
1 answers

Can I use this booster with a wilwood aluminum master cylinder?

Brett
TO
September 24, 2011

Can I use this booster with a wilwood aluminum master cylinder?

Answers

September 27, 2011
John
This booster can be mated to any master cylinder with the common two bolt horizontal mounting pattern designed to work with power brakes. Wilwood master cylinder number 8352608555 or 556 can be used as the master cylinder is designed to work with manual brakes as it comes or by inserting the slug into the piston bore it reduces the bore to a slight dish to match up with the booster. Simply verify the master cylinder can be used with a power brake application.
Page 1 of 1

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