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How to replace a hydroboost

Leaking hydroboost

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1994 Chevrolet astro van awd


I think that van has "hydroboost" brake assist instead of vacuum powered assist. Hydroboost uses pressure from the power steering pump to assist the brakes. However, I am unsure where the problem is. It could be a leak in the hydroboost itself, a leak in the line, a bad pump, or as easy as low power steering fluid.

Jan 08, 2017 | Chevrolet Cars & Trucks

1 Answer

I have a 99 chevy one ton....just replaced the hydroboost and now the brakes get sucked to the floor...ive checked for kinks in lines or blockage still no results...how do I fix ths


You may have a internal leak in the master cylinder remove it from the hydro booster and check to see if there is any fluid coming out the back if not the inner seals are bypassing that's why you got no pressure.

Mar 10, 2014 | Chevrolet Cars & Trucks

1 Answer

Bleeding air from system after replacing hydroboost


A GM truck?
The hydroboost won't need bled as far as the steering fluid.
If the brake lines have been unhooked and the master cyl is not new,
easiest way is just loosen the master cyl. cover and open the wheel
bleeders one at a time,gravity will do the rest,just wait till clean air
free fluid comes out of each one. Remember to keep the master full.
Takes awhile but not pumping the pedal keeps the air from getting
whipped up in the lines.

Mar 16, 2013 | Cars & Trucks

2 Answers

Truck wont stop,brake pedal goes to floor, hydroboost, steering pump, replaced


This sounds like a bad master cylinder, are you getting a brake light?

Sep 14, 2011 | 2004 GMC Sierra

1 Answer

How are you i have GMC sierra 1500 hyprid . the problem is no power steering and no brake this two problem get togother


make sure it has power steering fluid in it see if it has a leak. those have hydroboost brake assist - which is power assist from the steering pump. If the hydroboost goes out, no power steering.

May 04, 2011 | GMC Sierra 1500 Hybrid Cars & Trucks

1 Answer

2001 Chevy Silverado 3500 6.0L V8 4x4 Dually, I replaced the power steering pump about 2 months ago, now I have power steering fluid leaking from underneath drivers side dash and carpet is saturated, also...


This sounds like the hydroboost unit is leaking.behind the master cylinderThe braking system on this using the power steering pump to provide power assisted brakes instead of a brake booster. The hydroboost unit most likely needs replaced.

Apr 19, 2011 | Chevrolet Silverado 3500 Cars & Trucks

1 Answer

My 2000 3500CK break master cylinder is leaking fluid out of the drip hole on the bottom of the cylinder?


They are designed to do that when they go bad. That means it is time to get it replaced. 2 things need to be considered with your truck: 1st, does it use a hydroboost brake system? If it is a diesel, than yes, but some gas engines did as well. If you have lines running from your power steering pump to the back of your master cylinder, it is a hydroboost. 2nd, does your truck have anti-lock brakes? If you answered yes to either, than, unfortunately, you will need to get or pay someone with a scan tool to bleed the system after it is replaced. However, you may be able to get it real close yourself if the brake lines leaving the master cylinder are angled downwards at all. If they are, then you can bench bleed the new cylinder and install it yourself, and as long as fluid did not leak out of the lines, you should be alright.

Nov 03, 2009 | 2000 Chevrolet 3500

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