Q: Master cylinder and brake booster leaking

asked by on February 25, 2016

The brake booster and master cylinder in my truck are leaking.

Brake Master Cylinder Replacement $172.33 - $936.72 Get a Quote

Worn master cylinder seals can cause brake fluid to leak into the brake booster, damaging it. I’m guessing this is what happened to your truck. Replacing both the master cylinder and brake booster is the only way to solve this problem. A trained professional, such as one from YourMechanic, can do this for you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I use the turn signals?
The turn signals are important safety features that alert surrounding drivers when you intend to make a turn. When you turn on one of the signals, front and rear lights on that side of your vehicle will flash. The turn...
i can't remove my clutch, brake, gas pedal assembly
For this job in particular, my best advice would be to hire the hand of an experienced technician. The assembly takes a certain amount of manipulation and persuasion to get out properly. There may be a few extra hidden fasteners...
Car runs rough and shuts off - 1990 BMW 750iL
Without some additional symptoms, this is hard to say. If the car runs smoothly when warm, this would reflect a "cold start" problem with the engine. If the transmission shifts harshly either cold or hot, the transmission may need repair...
Car will not start, only clicks once or twice.
Hello. Clicking when you turn the key is usually a sign that there is not enough power for the starter (https://www.yourmechanic.com/services/starter-replacement) to fully turn. If your battery is new, then that is likely not the source of the problem. I...
Tire pressure sensor goes on and off, even when tires are all inflated to 32 and are staying there.
Hello. I would recommend checking your spare tire (https://www.yourmechanic.com/article/how-to-tell-if-your-spare-tire-is-still-in-good-condition) to see if it is at the correct psi. Sometimes spare tires also have tire pressure sensors (https://www.yourmechanic.com/article/what-is-my-tpms-light-for). If this is not the issue, you likely have a defective sensor, that...
In park, the engine just keeps revving.
Hello and thank you for contacting YourMechanic. There is an issue with the security system. The security is active and needs to be disabled. If the security is active, then the engine will act out and have a low rpm...
Can a 2000 dodge caravan fuel injector wiring harness be used on a 1999 Dodge Caravan, engine being a 3.3L 6 cylinder flex fuel.
Hi there, thanks for writing in. To my knowledge, Dodge did not make significant changes from the 99 to 2000 Caravan 3.3 liter engine. However, with that being said, it's hard to know for 100% certainty that the fuel injector...
Why does my heater only blow warm and not hot on my 2000 Dodge Stratus
Hello. It does take some time for the coolant to get hot enough to blow hot inside of the vehicle. I usually start by checking the coolant level. Low coolant will cause this. If the coolant level is fine then...
Door ajar warning and globe light stays on when all doors are shut and car is running 2003 Ford Explorer
This vehicle has a computer system to scan to get the door data to show what door is showing open. Any one of the doors may be causing the issue. The most common is the drivers door ajar switch since...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Captiva Sport
The The 2012 Chevrolet Captiva Sport is a brand new vehicle and is an eco-conscious crossover SUV for the environmentally friend consumer. It comes standard with many features, but also has many available options so it can suit any buyer’s...
The Best Used Cars to Buy If Safety is #1
Maybe Maybe you’re a parent buying the first car for your teenager, or perhaps you’re a new parent and the safety of your little one is of the utmost importance. Or perhaps you're a safety-minded individual looking to make a...
Industry News for Automotive Techs: October 8-14
50 MPG Chevrolet Cruz Diesel, Mazda's G-Vectoring drive system, Uber and Volvo collaborate on autonomous cars, and Hubb's new reusable oil filter.