Brake suddently stop working after collision
Thread Starter
|
Junior Member
Joined: Oct 2023
Posts: 1
Likes: 0
Brake suddently stop working after collision
Hey Volvo community,
I have a question that has been bothering for quite a while.
I had a Volvo Xc 60 that was purchased almost 10 years ago. I was driving on a highway and got hit by a trunk, which then surpassed me from the left lane. After the collision, the air bags on the left side came out and then the brake suddenly stop working. I cannot slow down the car at all. I also smelled something burning.
I hope someone here, especially mechanics, can help me understand how the brake stopped working. I had my last check-up/maintenance a week before the collision.
Thanks a lot in advance!
I have a question that has been bothering for quite a while.
I had a Volvo Xc 60 that was purchased almost 10 years ago. I was driving on a highway and got hit by a trunk, which then surpassed me from the left lane. After the collision, the air bags on the left side came out and then the brake suddenly stop working. I cannot slow down the car at all. I also smelled something burning.
I hope someone here, especially mechanics, can help me understand how the brake stopped working. I had my last check-up/maintenance a week before the collision.
Thanks a lot in advance!
Super Moderator
Joined: Mar 2012
Posts: 9,598
Likes: 539
From: Burlington, VT
sounds like something mechanical ie the master cylinder, or more likely a hose got damaged fluid leaks/hoses have let air into the system. How does the pedal feel? Does it pump up after 4-5 fast foot pumps?
Brakes are still 90% mechanical systems - if you lose the ABS system, brakes still work unless a valve in the distrubutor is stuck - and that will only impact one pair of wheels. If you loose the vacuum booster, brakes still work - just a firm pedal that tests your leg strength. Low fluid should be easy to spot (open reservoir cap), check for leaks and mechanical damage to lines.
To further the diagnosis you may need to start opening lines - I'd start with a buddy to pump the brakes while checking each caliper for action. then I'd bleed the brakes - starting with the rears to see if any fluid/air comes out with each foot pump. If no action on the rear brakes, then you'd move up to the ABS valve body to see if fluid is getting from the master to the ABS. You can also try bleeding the master to see if that has any pumping action.
The something burning is likely a caliper that is stuck closed. That could be the caliper or could be there is no path for the fluid to return back to the master (crimped line? defective master or proportioning valve or abs valve body). Did you happen to slam on the brakes during the collision?
Brakes are still 90% mechanical systems - if you lose the ABS system, brakes still work unless a valve in the distrubutor is stuck - and that will only impact one pair of wheels. If you loose the vacuum booster, brakes still work - just a firm pedal that tests your leg strength. Low fluid should be easy to spot (open reservoir cap), check for leaks and mechanical damage to lines.
To further the diagnosis you may need to start opening lines - I'd start with a buddy to pump the brakes while checking each caliper for action. then I'd bleed the brakes - starting with the rears to see if any fluid/air comes out with each foot pump. If no action on the rear brakes, then you'd move up to the ABS valve body to see if fluid is getting from the master to the ABS. You can also try bleeding the master to see if that has any pumping action.
The something burning is likely a caliper that is stuck closed. That could be the caliper or could be there is no path for the fluid to return back to the master (crimped line? defective master or proportioning valve or abs valve body). Did you happen to slam on the brakes during the collision?
Thread
Thread Starter
Forum
Replies
Last Post
enojet
New Members Area
0
Jul 27, 2018 09:33 PM