IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: phil_long on September 12 2014, 09:23:43 AM

Title: Vacuum brakes
Post by: phil_long on September 12 2014, 09:23:43 AM
Good morning gents.  I meant to ask this question a while ago. My brakes were switched over to vacuum brakes years back.  Sometimes I notice after I hit the gas really good and then immediately tap the brake, the brake pedal is hard for a second before going back soft and allowing to stop properly. What do i need to fix this problem? Thanks
Title: Re: Vacuum brakes
Post by: PacecarTA on September 12 2014, 10:29:48 AM
replace the check valve at front of booster
i run a second checkvalve  inline that i get from imports in the junk yards
Title: Re: Vacuum brakes
Post by: phil_long on September 12 2014, 10:55:42 AM
check valve is that round piece that goes in between two hoses? Thanks for the response Paul. Can I pick one up anywhere?
Title: Re: Vacuum brakes
Post by: Steve Wood on September 12 2014, 11:31:10 AM
Normally, the check valve is the plastic piece that plugs onto the grommet on the booster...Hose from plenum connects to it.

Paul is saying that he added a second check valve in the line to that one.  There is also a filter in the line on some cars which is a bigger can than an inline check valve

And, yes, any parts store will have one...often on the HELP rack
Title: Re: Vacuum brakes
Post by: phil_long on September 12 2014, 02:26:08 PM
thanks for the help guys. 
Title: Re: Vacuum brakes
Post by: phil_long on September 12 2014, 02:27:19 PM
I finally fixed my hood.  I changed the oil last weekend.  Also installed that SLIC that was laying around.  Car seems to run great.  Loves the cooler weather for sure.  I still have the boost turned down pretty low.
Title: Re: Vacuum brakes
Post by: Steve Wood on September 12 2014, 03:57:38 PM
while you are on a roll, you can come help me work on cars...they all need something
Title: Re: Vacuum brakes
Post by: phil_long on September 15 2014, 08:17:34 AM
Now as lazy as i am Steve, that'd be a miracle.  I would be interested in seeing that motor you got installed in your other car. That thing is gonna be a monster.
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