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Questions tagged [brake-booster]

A vacuum, electrical, or hydraulic driven component of a braking system on motor vehicles to multiple the manual force applied to a brake pedal operated by a driver

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18 views

2010 Camry - Can Brake Booster Push Rod be Loose?

2010 Camry, I4. Heard snap while driving, pedal went to floor. Had some brake power but pedal always went to floor under moderate-heavy braking, drove home (no traffic, etc). Assumed master cylinder. ...
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29 views

Brake Lights Stay On

I attempted to replace my master cylinder and brake booster. Now my brake lights are stuck on. I recall a ratcheting sound after disconnecting the booster from the brake pedal. The brakes feel as if ...
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61 views

How to drain a brake booster

I improperly installed a master cylinder. This punctured a hole in the cylinder. I didn't realize this until I pumped a gallon of brake fluid into my booster. How do I get it out? 2014 jeep wrangler ...
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2k views

Hissing/air sound when applying brakes

I recently noticed that when applying the brakes, I can hear a hissing sound that is similar to air being released. The car is a 2006 Infiniti g35x. I did a thorough search and the problem that comes ...
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Can a brake booster vacuum hose malfunction in a situation where the car is wet but work fine when the car is dry?

I'm posting this in follow up to this question. To summarize, when conditions are wet (snow or rain) after a few minutes without braking my car will lose the ability to slow down quickly. I'd ...
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1answer
43 views

How this particular hose works?

Anyone can explain how the "yellow" hose works? it seems to be 2 hose stack together in the middle. What connection is it and how is it works? Like where the vacuum flow inside those hose? The reason ...
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2answers
2k views

Gasket between master cylinder and brake booster?

So I replaced my master cylinder on my 1995 Acura legend and there a hissing sound coming from the brake booster area. Upon more thorough inspection, I found that placing my finger on the bottom side ...
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21 views

Normal Brakes? Master Cylinder replacement gone bad?

The brakes after I bled them and changed the master cylinder feel like they start to grab when the pedal is 1/3-1/2 the way depressed, is this normal? I did bench bleed the master cylinder before I ...
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773 views

How do I bleed the master cylinder and check the booster for fluid?

We bled the brakes after replacing the 4 brake hoses that run to the calipers since a hose burst the other day. We bled them, and the brakes still feel spongy and the fluid is decreasing ever so ...
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1answer
56 views

Brake paddle goes down when pressing the accelerator paddle

I have a Nissan Sylphy 2002 with ( QR20DD engine ). The problem I'm trying to diagnose is: When I'm sitting on a traffic or when I keep my brake pedal pressed all the way down, it keeps solid as it ...
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1answer
3k views

2004 Volvo XC90 Vacuum assist pump nightmare

My 2004 Volvo XC90 T6 2.9 has a Vacuum assist pump for the brake booster that should only come on briefly when the engine is cold and then not come on anymore. Mine comes on periodically all the time, ...
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1answer
1k views

Low Break Fluid & Spongy Brakes

Good day all, I was driving the other night (about 3 days ago) and noticed my brakes feeling different as I had to floor it to come to a stopping point. I immediately came out and checked the brake ...
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174 views

What vehicle does this master cylinder and booster go too

This is a pic of my old master and booster off my 1966 chevy c10. It is not correct to vehicle. I'm trying to figure out what make and model vehicle this is for. Any help would be much appreciated. ...
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Diagnosing Hydroboost Brake Systems

I have a 91 Chevy Astro with the hydroboost brake system. I took my van to a shop because I was having difficulties with the brakes. I was informed that this was due to low brake fluid and I needed a ...
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573 views

What reasons for a Brake pedal that depresses slowly

2003 Chevy Tahoe Z71 here. This morning as I was driving to work I noticed my brakes were a little unresponsive. I recently checked the pads/rotors and they are in good shape. When I push the pedal ...
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2k views

1996 Ford E350 Club Wagon - Brake pedal will not return

I have a 96' Ford E350 Club Wagon. When I press the brake pedal the brakes work great however the pedal does not return fully. I have bleed the brakes, exchanged all the old fluid, checked the few ...
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1answer
675 views

Is a water-logged brake booster salvageable?

Last week water found its way into my M5's brake booster. The M5 forums document that people who have suffered from a similar problem will replace their brake booster to fix it. No mention is made of ...
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590 views

Power Brake Booster Removal

Can someone please explain the easiest way to remove a Power Brake Booster from a 1994 Honda Accord Wagon lx. everything has been dismantled. the hard part here is the removal only part. there isn'...