brake booster/hydro booster
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Posting Guru
Joined: Sep 2007
Posts: 1,715
Likes: 2
From: Seneca, SC
yes no brakes at all. Mechanic said that it was either the hydro booster or master cylinder. There are no leaks in the break lines or or at the calipers. When you push down on the pedal it just goes to the floor. The reservoir is full and is not leaking nor is the master cylinder.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Roland has it! Reps to him!
The hydroboost only puts the POWER in power brakes.
Even without the hydraulic pressure from the "power steering" pump, you WILL have brakes. Just not POWER brakes.
The same is true with your power steering if you lose the hydraulic system. You'll still have steering, just not power steering.
If you have NO brakes, i.e. pedal to the floor, it's not the hydroboost, it's the master cylinder.
Pop.
The hydroboost only puts the POWER in power brakes.
Even without the hydraulic pressure from the "power steering" pump, you WILL have brakes. Just not POWER brakes.
The same is true with your power steering if you lose the hydraulic system. You'll still have steering, just not power steering.
If you have NO brakes, i.e. pedal to the floor, it's not the hydroboost, it's the master cylinder.
Pop.
Postmaster
Joined: Jan 2009
Posts: 2,667
Likes: 1
From: Glen Rose,Texas
This is the reason I was asking for more info.I was also thinking he had a master cylinder problem and the H.boost was fine.Reps to both
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Postmaster
Joined: Jan 2009
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From: Glen Rose,Texas
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Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
I fail to see how that could happen, but you never know....
This sparks a bunch of research for me, because now I have to know why the pedal went to the floor as a result of a bad hydroboost unit, given the fail-safe design.
Would you be willing to ask your mechanic the exact nature of the failure?
Pop
This sparks a bunch of research for me, because now I have to know why the pedal went to the floor as a result of a bad hydroboost unit, given the fail-safe design.
Would you be willing to ask your mechanic the exact nature of the failure?
Pop
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
I agree. I also would like to know more. The hydroboost system hasn't changed much in decades. A problem causing a brake pedal to feel like stepping on a plum isn't a symptom of which I am aware.
(with apologies to C.W.McCall!)
(with apologies to C.W.McCall!)
Elder User
Joined: Dec 2006
Posts: 718
Likes: 2
From: Chattanooga, TN
I'm in agreement with you guys - it should have been the hydrobooster.
I had a GMC with a hard brake pedal and I replaced the vacuum booster and all was fine.
There is something else going on there or maybe there is some sort of bypass that is acting up.
Interesting.
I had a GMC with a hard brake pedal and I replaced the vacuum booster and all was fine.
There is something else going on there or maybe there is some sort of bypass that is acting up.
Interesting.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
But he didn't have a hard brake pedal. His went all the way to the floor, instead. That's a sign of a failed master cylinder.
That's why we're having such a hard time figuring out what might have gone wrong with the hydroboost unit that would cause the same symptom.
Pop
That's why we're having such a hard time figuring out what might have gone wrong with the hydroboost unit that would cause the same symptom.
Pop
