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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: cwilson jr on April 23, 2009, 01:06:43 pm

Title: brake booster
Post by: cwilson jr on April 23, 2009, 01:06:43 pm

while looking over something for bleeding the brakes, i see there are two different boosters on these trucks and didn't really see how to determine which you have.  there was a regular, i assume and a "hydro-booster".  i have an 85 with power brakes.

Title: Re: brake booster
Post by: Captkaos on April 23, 2009, 03:22:07 pm

there is a regular and dual diaphram (HD version)
Hydroboost has no booster.
We need a tech page on boosters :)

Title: Re: brake booster
Post by: eventhorizon66 on April 23, 2009, 03:50:33 pm

Hydroboost uses to the power steering pump to provide boost, if you had it there would be three lines (two high pressure, one return) running from the PS pump to your booster behind the master cylinder.  It looks nothing like a diaphram booster, which uses engine vacuum.  I am running an aftermarket hydroboost kit.  Here's a pic.

(http://i208.photobucket.com/albums/bb247/1985C10/closeup_of_hydroboost.jpg)

Title: Re: brake booster
Post by: ITSANSS on July 11, 2010, 01:57:22 pm

So, to be clear, if you don't have hydroboost, you have the classic two lines coming from the power steering pump?

I went to buy a new power steering pump and reservoir the other day and they asked if I had hydroboost or not.  Had not a clue.  Haha

Title: Re: brake booster
Post by: VileZambonie on July 11, 2010, 02:29:15 pm

If you want I can do a tech description on brake boosters, master cylinders, and control valves.

Title: Re: brake booster
Post by: ITSANSS on July 11, 2010, 09:11:25 pm

Quote from: VileZambonie on July 11, 2010, 02:29:15 pm

If you want I can do a tech description on brake boosters, master cylinders, and control valves.

You're more than welcome to.  I'm sure it would save people from threads like these.  lol However, I, like the original poster, just want to know how to tell whether I have power steering with hydroboost or not.   :P

Two lines = no hydroboost.
Three lines = hydroboost.

Right?

Thanks

Title: Re: brake booster
Post by: Blazin on July 12, 2010, 01:50:33 am

Hydroboost will have lines coming from the power steering pump, like the one pictured above.
Power brakes have a large vacuum line coming from the back of the intake, or back base of the carb. area.
Non power brakes are just a master cylinder right off the fire wall.
All diesels trucks have hydroboost. All 1 tons diesel and gas have hydroboost.

Title: Re: brake booster
Post by: VileZambonie on July 12, 2010, 04:47:13 am

Quote from: ITSANSS on July 11, 2010, 09:11:25 pm

Quote from: VileZambonie on July 11, 2010, 02:29:15 pm

If you want I can do a tech description on brake boosters, master cylinders, and control valves.

You're more than welcome to.  I'm sure it would save people from threads like these.  lol However, I, like the original poster, just want to know how to tell whether I have power steering with hydroboost or not.   :P

Two lines = no hydroboost.
Three lines = hydroboost.

Right?

Thanks

I was replying to Chris as I thought you got your answer already.

Title: Re: brake booster
Post by: Captkaos on July 12, 2010, 10:27:29 pm

Please do Vile.

Title: Re: brake booster
Post by: Lt.Del on July 16, 2010, 12:10:07 pm

feel free to use any of these pics that i took when i replaced mine....

http://forum.73-87chevytrucks.com/smforum/index.php?topic=5202.0