1.100% quality diaphragms, plastic hub and check valves are installed on every unit for perfect performance         

and reliability

2.All vacuum power brake booster units are 100% vacuum tested to ensure reliable.

3.Exclusive rust-against finishing process extend unit life.

4.Master cylinder output rods are pre-adjusted for easier and faster installation

Import duties, taxes are not included in the item price or shipping cost, buyer is responsible for 

paying any import duty and tax, for details, please check with your  custom to find what 

additional charge will pay before you place the order.

2.If your address is remote area, buyer will pay extra remote charge.

About Comments

1.Thanks for respected customer to use our products, we sincerely hope it will bring you happiness  

experience. If you are satisfied with our quality and service, please kindly give us five star comments. 

2.When you receive the products, if there is any problem, please contact us at the first time, we will try 

to help you until the problem is solved. 

About Return Policy

We always pay more attention to satisfy our customers request in quality, but return are accepted within 

10 working days of receiving the products, we hopefully we can receive a return item with good 

condition and packing, before your return, please contact us first, we will try to give you a good solution.

1. What does a booster do?

A power booster helps assist pushing the master cylinder piston when you apply the brakes.

2. What are the performance of a problem brake booster?

A bad power booster will give a very hard pedal, it will feel like you need two feet to stop the car.

3. What size booster should I use?

For lighter weight vehicles like street rods a 7" booster will work fine for disc/drum set ups. For a 4 wheel disc system a 

7" booster will not give enough assist. An 8" dual diaphragm booster is the ticket for 4 wheel disc.

4. The brake pedal is low and soft. I think I need to replace the booster, right?

No. The booster will never cause a low or soft pedal, check for air or other hydraulic problems. A failed booster will 

only cause the pedal to become hard or not return.

5. After some time of brake applications, the pedal starts to get hard. How do I fix this?

Check the vacuum source to the booster. Not only does the booster need at least 15 in. Hg, it also needs vacuum 

volume. The fitting normally on the intake manifold or carburetor will get clogged with carbon build up and restrict the 

vacuum volume.

6. I replaced the booster and now the brakes are locked up and won't release. What should I do?

Replace all brake fluid. Brake fluid is hygroscopic which means it absorbs moisture. Too much water in brake fluid will 

cause vapor lock and apply pressure to the wheels. Also, carefully check for proper push rod adjustments and stop 

light/cruise control switch adjustments.

7. The original problem was a hard brake pedal. I replaced the booster and I still have the same thing. What can I do 

now?

Check for a seized caliper/wheel cylinder, pinched or restricted brake line. Next check vacuum source. Check for at least 

15 in Hg. Next check vacuum volume. TIP: An easy test is to park a vehicle with a good brake pedal next to your car and 

run the vacuum to booster in question. If pedal is OK now, vacuum source is insufficient.

8. I installed a new booster. Why am I hearing an air noise under the dash?

This is usually a normal noise made during brake application due to atmospheric air entering the booster filter located 

around the push rod. Tip: Moving the silencer (foam seal) may reduce noise level.

9. I replaced 2 boosters in during one year. What may cause the situation?

Check for gas vapors in the booster. If the vehicle's PCV is clogged, gas vapors will enter the booster and dry up the 

diaphragm. Repairing PCV system and installing a charcoal vacuum filter will eliminate problem.

10. I took off my old booster and there was brake fluid between the master cylinder and booster. Which one do I replace?

Replace both master cylinder and brake booster.

11. How much pressure should I be getting to the wheels with a power booster?

Typically you should expect about 1.0MPA. to the wheels for a disc brake system. A disc brake system requires this 

amount of pressure so be careful when using a smaller 7" booster that puts out only 0.9MPA pressure.

12. How much vacuum is needed to operate a booster properly?

For a brake booster to function properly you will need at least 16" of vacuum. Anything lower will give you a hard pedal.

13. I have drum brakes, can I use the same booster if I change to disc brakes?

Sure. Just be sure to they have same brake master cylinder.