Q: Brakes go to floor

asked by on February 06, 2017

I hear a hissing noise when brake pedal is depressed and slowly goes to floor and does not stop truck. But when I depess it fast it works as before. Master cylinder-no leaks. What do you think?

My car has 70000 miles.
My car has a manual transmission.

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 you start the engine?
There’s more to starting your engine than just sliding into the driver seat and turning the key. While it’s not super complicated, there are a few steps that you should know. Here they are: Check that the parking brake is...
What if I think the Passenger Air Bag Off Light is incorrect?
If you think that the Passenger Air Bag Off Light is turned on when it shouldn’t be, there could be a number of different reasons. Assuming that the person in the passenger front seat is adult sized and sitting in...
How do I fold down the rear seats?
The rear seats can be folded down to create extra storage space in the rear of the vehicle. Folding the rear seats takes a few steps, but is easy: 1. Latch the center seat belt into the side of the...
Difficult startup, low battery voltage, no oil pressure with windows, sunroof and locks malfunctioning
If the battery tested good, then I would suspect a problem with the alternator (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-alternator). The battery is basically just an electronic storage device that must be charged regularly by the alternator. In addition, there are a couple dozen modules...
Driveshaft assembly
Hello, thanks for writing in. The driveshaft assembly is composed of the driveshaft, U-joints and snap rings. Both ends of the driveshaft connect to the output shaft and differential via yokes. If you would like help with this replacement, consider...
My car randomly shakes
The shaking you are feeling is likely a tire or suspension issue. As with diagnosing any problem, start with the simple solutions first. Make sure your tires are properly and evenly inflated. Make sure your tires are balanced properly. Tires...
Is my aftermarket stereo draining my battery?
A properly installed system should not drain your battery in 4 days. Obviously, the simplest way to rule it out would be to disconnect the stereo for a few days and see if that remedies your problem. If it does,...
Nissan rouge 2013 slip light is on.
Hi there. Vehicles like yours have had the same issue with the brake master cylinder leaking brake fluid into the brake booster causing the fluid level to be low. This was turning on the Slip Indicator Light. Check your brake...
I need to replace my turbocharger boost sensor.
You have two charge pressure sensors and are labeled sensor 1 located near left rear of motor and has a violet, brown and blue wires going to it. The second sensor is also on left rear of motor and has...

Related articles

A Buyer’s Guide to the 2012 Ford Focus
The The 2012 Ford Focus brings a lot to the world of compact cars. Available as either a four-door sedan or a five-door hatchback, the Focus has great fuel efficiency and European styling that sets it apart from other cars...
The Best Used Cars to Buy for Families
If If it’s time for you to search for the top used cars specifically for families, check out the list we’ve put together of the top five. The list of must-haves Typical items that families are looking for in their...
How to Use the Ford Active Park Assist Feature
There There are few driving maneuvers as universally disliked as the parallel park (https://www.yourmechanic.com/article/how-to-park-your-car). Most people still remember that terrifying sequence of movements in their driving test. Even people who live in metropolitan areas, people who must regularly parallel park,...