GM Hydroboost Seals

Starting At
Sale price $ 26.95

Choose options to update the price

Choose Your Options:

Include Tool?
Include Figure 8 Seal

If you have a power steering leak between your master cylinder and your hydroboost this seal is exactly what you need to repair it. The repair can be done by almost anyone by following the repair video below. Typically these leaks are not actually your power steering pump or reservoir, instead just this cheap seal! This seal is MADE IN THE U.S.A. and comes with FREE USPS SHIPPING WITH TRACKING.

These repairs require a special socket which most people do not have. If you don't know if you have the socket we will include a brand new socket so you can ensure you have the right tools to get the job done.


If your leak is between the master cylinder and the hydroboost the circular seal is the issue. If your leak is from the middle of the hydroboost, the figure 8 seal is your issue.

We always recommend replacing both seals during any repair as it is likely both seals are worn and they could be damaged during dis-assembly & re-assembly.

These seals are proudly made in the United States.

There are two variations of the piston seal, so if your vehicle is not listed then the manufacturer likely changed the piston seal variant used throughout the build of the vehicle. You can select "Vehicle Not Listed (But Has Hydroboost)" and that kit will include both variations of the piston seals. You will not use one of the piston seals, however if you select that option you will be sure to have the correct size piston seal.

The "Vehicle Not Listed (But Has Hydroboost)" will fit ALL hydroboost units.

Yes, we offer various different shipping methods including 1 day service. Rates are calculated and displayed at checkout.

Why Choose Boost Auto?


Customer Reviews
4.8 Based on 98 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
A Boost Auto Parts Customer
Timothy N.
United States United States

Hydro what?

Now I know what a hydroboost is, how to rebuild it and why replacing my PS pump and both lines didn't stop that PS leak. Now that I know better, wrapping a plastic bag around the hysdroboost and driving for a few days will confirm if it's leaking.

Timothy C.
United States United States

Awesome Replacement Kit

Awesome experience and easy working with the Hydro boost seal kit!!!! Seals were an exact match and the special socket was great to have!

Chris S.
United States United States


The item fixed my issue as expected

steve s.
United States United States

hydroboost seal

part arrived on time, and it fixed the leak

Jorge C.
United States United States

Best $30 I've spent

This was the best $30 I've spent. I went in thinking it was going to be a difficult job but with the socket that was supplied with the package, the job was super easy. I didnt even need to remove the hydro boost off the car to replace my leaking gasket.


Looking for quality? You've found the right place

All our products are quality tested here in the USA.