2000 S80 Loss of power brakes

rerobin66 · Post by **rerobin66** » 30 Jul 2014, 19:57

Twice within the past two days I have had no power brakes while backing out of the garage. I stop the car turn off the motor and restart and have power brakes again. Any ideas?

rerobin66 · Post by **rerobin66** » 01 Aug 2014, 14:10

So of the many views and no solutions, and being the girly girl genius that I am.....it is a vacuum leak in a seal under the rubber boot on the cabin side of the power brake booster. This would explain why there are no warning messages from my computer. I removed the panel that covers the driver side area to access this side of the booster. After manipulating the rubber boot a bit I was able to stop the air from leaking. However it has to remain in that exact position or I hear it hiss air again. So I decided it must be a seal around the rod that attaches to the brake pedal that has dried out. Seems like such a waste to have to replace the whole booster due to leaking seal(s). Well for now I greased the rod and surrounding area to hopefully add moisture to it and I have no hissing, so I assume it is not leaking. The brakes still make a air release noise when pressed, but I think they all do that. Correct me if they should not. Perhaps someone viewing will at least know that!

Post by **jkdjim** » 01 Aug 2014, 16:11

I have a similar problem and assumed it is a bad brake booster. They're $250 or so aftermarket so I'm just dragging my feet with replacing it.

rerobin66 · Post by **rerobin66** » 01 Aug 2014, 16:23

I am going to drag my feet too! And see if I have revived the seal so that it will hold pressure.....we will see!

rerobin66 · Post by **rerobin66** » 08 Aug 2014, 13:40

I really don't want to replace my power brake booster, but I know that is the issue. So I have clipped my nails to standard mechanic length and crawled under the dash, again. I have tightly wrapped the rubber boot with electrical tape to stop the air leak. We will see. And I have concluded that the best tools to work on my old Volvo are super glue and black electrical tape!

rerobin66 · Post by **rerobin66** » 08 Aug 2014, 18:06

Bit the bullet, no more dragging my feet! This girly, girls got this!
Volvo Brake Booster (S80 S60 V70) ATE 8649491

$151.11 1 $151.11
Order Total: $156.10
Subtotal: $151.11
Promotion (Loyalty Code: $5 off $149+) -$5.00
Shipping $9.99

lonestar245 · Post by **lonestar245** » 20 Aug 2014, 17:32

FCP Euro?

Let us know how the replacement goes. I have a vacuum leak in the brake system somewhere, and I am considering changing the booster in hopes that that covers all the possible areas for leaks.

edit: looking at brake parts for my 2002 S80- the booster is more expensive, and there are other potential problem areas for my issue- booster vacuum ejector, booster vacuum switch, brake vacuum pump, hoses... (shakes head)

Post by **jkdjim** » 20 Aug 2014, 18:12

Shit $150?! I thought it was $250 easily, even on FCP. I'm gonna jump on this sooner rather than later.

edit: anyone know when to replace the vacuum switch (31400692) and/or the vacuum ejector (30665561)?
Should I replace them with the booster, or could these be what are at fault?

rerobin66 · Post by **rerobin66** » 07 Sep 2014, 17:32

I had to go out of town. So hubby did the whole removal and install of booster. He said it sucked. But he did a great job. the only issue was that the brake failure warning and abs, and traction lights came on after he was done. Today, now that I am home, we pulled the ABS module off and cleaned it up and reinstalled, all warnings went off (gone) and it is perfect again!