Question about Chevrolet C1500
Your power brake booster is leaking vacuum, you will in the end loose the power brakes, it is called the power booster, they are available from any good parts store, like NAPA, very pricey at dealer. Some units are available separately, others they want you to buy the booster and master cylinder as a unit. It takes a couple of hours to replace, and the brakes will have to be bleed if you end up replacing the master cylinder, 2 people make the job much easier.
Posted on Aug 04, 2008
Good overview !, for my sister ! I would like to see a breakdown on How to R&R. The retaining clip has a dual purpose, it is also retaining a Plastic gizmo riding on top of the brake pedal plunger rod? We destroyed ours in the removal, I wanted to pull the coulmn, just to get at the the clip, any one out there with any expolded views, let me know.
God Bless & thanks,
Posted on Oct 08, 2008
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Posted on Jan 02, 2017
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Posted on Jan 22, 2009
Actually it sounds like the vacuum booster,which would explain the hissing noise.You easily check this,with the truck running depress the brake pedal and feel for air movement around the actuator rod that comes through the firewall and connects to the brake pedal.Fluid leaks either in the cab or around the master cylinder are generally the first sign that a master cylinder has gone bad.
Posted on May 06, 2009
your brake booster is leaking internally. this is a one piece, non serviceable component, and the entire assembly must be replaced. good luck!
Posted on Jul 07, 2010
Testimonial: "Thanks, I had a suspicion"
most likely have a bad diaphram in the brake booster that hisssing sound is vacuum leaking under hood there will be hose going to brake booster unhook hose and pinch off hose start car does hissing sound disappear if so bad booster
Posted on Sep 03, 2010
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