What is your question?
·
·
What is your question?
The brake light and abs light are on all of the time and when you step on the pedal, it is really soft and goes almost to the floor. Any ideas? The master cyl is full of fluid.
2 Replies
When a conventional brake booster that is vacuum operated (either from manifold vacuum or an engine driven vacuum pump), if the booster or vacuum check valve fails the brake pedal gets "hard" and requires a lot more driver's foot effort on the pedal to stop the car. Brake boosters provide brake assist> I wonder if the brake master cylinder is failing. A repair shop should test this. They will either clamp of the flex lines to each wheel and see if the pedal gets firm, if so the problem is not the master cylinder. If the pedal does not get firm they will try bleeding the brakes and if the pedal still is not firm the master cylinder is most likely unable to develop hydraulic pressure.
Sounds like there is a lack of pressure in the brake system. Perhaps a fluid leak . . . any fluid under the truck? It could also be the brake booster. It's impossible to diagnose without looking at the car, and it's a critical safety issue, so I'd take it to a shop and have it worked on ASAP.
There isn't any fluid under the truck or a leak anywhere that I can tell. The fluid level in the master cyl doesn't go down. Is there a way to test the brake booster to see if it's working or not?
I'm sorry. I don't know how to test the booster.