IPD - Volvo Parts SpecialistsVolvo PartsVolvo Salvage: Used Volvo Parts and Over 50 Years ExperienceSouthern Vo Vo sells genuine used Volvo parts

Please use this Amazon link ... and help keep MVS on the Web. Thank you!Amazon.com

Advertise here via Google

Login

Not part of the forums? Register. It's free.

Need help? See our Help Page.

Symptoms of a bad brake booster?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Symptoms of a bad brake booster?

Postby jblackburn » 05 Mar 2012, 17:58

Since Saturday, my brakes just feel like they're not grabbing. They still hit the ABS - albeit, just barely - a few pulses - if you smash your foot down on the pedal, but I feel like it just needs more effort in normal driving - almost like stopping with wet rotors, but the roads are dry. Bad vacuum line? Check valve maybe?

I had a bad booster once on my Saab (when I'd just started driving), and they were so bad I blew through an intersection when a light turned yellow pretty far before the intersection. The Volvo's are nowhere near that bad, but I did find myself having to mash on the pedal when it wasn't slowing enough.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
User avatar
jblackburn
MVS Moderator
MVS Moderator
 
Posts: 13631
Joined: 08 Jun 2008, 21:54
Location: Alexandria, VA
Model and Year: 1998 S70 T5

Re: Symptoms of a bad brake booster?

Postby regent » 05 Mar 2012, 19:02

If the membrane in the booster is ruptured you will loose the brake assist; without it you would need about a dozen times 'heavier foot' on the pedal to achieve the required breaking effort. If you are unprepared, it feels like you have no brakes. I have had that happen to me in the past on a different europen make. :o
Thanks for sharing
2002 S60 2.4 non-turbo - lovely!
1987 340 DL (with the 4-cyl N/A Renault Diesel engine, 5-speed manual, RWD) - sold (I wish I did not have to...)

Definition for Stupidity: Doing the same thing over and over and expecting different results...
User avatar
regent
Forum Member
Forum Member
 
Posts: 742
Joined: 23 Feb 2010, 01:34
Location: USA
Model and Year: 2002 S60 2.4

Re: Symptoms of a bad brake booster?

Postby jblackburn » 05 Mar 2012, 19:05

So it would really feel like I had nothing for stopping power if the booster itself went bad, right?

Did yours make any strange noises or anything?
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
User avatar
jblackburn
MVS Moderator
MVS Moderator
 
Posts: 13631
Joined: 08 Jun 2008, 21:54
Location: Alexandria, VA
Model and Year: 1998 S70 T5

Re: Symptoms of a bad brake booster?

Postby regent » 05 Mar 2012, 19:11

It 'feels' like that because you expect it to behave differently.
If you had a bad check valve, your booster would still work, however it would lose vacuum as soon as the engine stops. With everything working 100%, you should have sufficient vacuum for 2-3 brake applications after you switch off the engine.
I would start by eliminating the vacuum lines first.

As far as noises, you may be able to hear a hissing sound from the booster if there is a small leak in it, but then you should have 'some" partial boost.
2002 S60 2.4 non-turbo - lovely!
1987 340 DL (with the 4-cyl N/A Renault Diesel engine, 5-speed manual, RWD) - sold (I wish I did not have to...)

Definition for Stupidity: Doing the same thing over and over and expecting different results...
User avatar
regent
Forum Member
Forum Member
 
Posts: 742
Joined: 23 Feb 2010, 01:34
Location: USA
Model and Year: 2002 S60 2.4

Re: Symptoms of a bad brake booster?

Postby jblackburn » 05 Mar 2012, 19:16

Makes sense! Thanks.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
User avatar
jblackburn
MVS Moderator
MVS Moderator
 
Posts: 13631
Joined: 08 Jun 2008, 21:54
Location: Alexandria, VA
Model and Year: 1998 S70 T5

Re: Symptoms of a bad brake booster?

Postby jblackburn » 05 Mar 2012, 22:11

It is indeed a vacuum leak. That hose was replaced 3 years ago, but it ripped near the clamp.

Got a Check Engine light confirming that too...the first in 2 years :(

I got a piece of hose and will put it on tomorrow when it's not freaking 30 and snowing sideways at 20 mph.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
User avatar
jblackburn
MVS Moderator
MVS Moderator
 
Posts: 13631
Joined: 08 Jun 2008, 21:54
Location: Alexandria, VA
Model and Year: 1998 S70 T5

Re: Symptoms of a bad brake booster?

Postby regent » 05 Mar 2012, 22:53

Glad you sorted it.
What a great benefit it is having the luxury of choosing when to do a job...
:)
2002 S60 2.4 non-turbo - lovely!
1987 340 DL (with the 4-cyl N/A Renault Diesel engine, 5-speed manual, RWD) - sold (I wish I did not have to...)

Definition for Stupidity: Doing the same thing over and over and expecting different results...
User avatar
regent
Forum Member
Forum Member
 
Posts: 742
Joined: 23 Feb 2010, 01:34
Location: USA
Model and Year: 2002 S60 2.4

Re: Symptoms of a bad brake booster?

Postby jblackburn » 07 Mar 2012, 17:24

FIXED! I have good brakes again!!!

Too bad something simple like that won't un-warp my front rotors :(
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
User avatar
jblackburn
MVS Moderator
MVS Moderator
 
Posts: 13631
Joined: 08 Jun 2008, 21:54
Location: Alexandria, VA
Model and Year: 1998 S70 T5

Re: Symptoms of a bad brake booster?

Postby regent » 07 Mar 2012, 22:52

I bought an unwarping kit for mine from FCP, and it worked right out of the box!
2002 S60 2.4 non-turbo - lovely!
1987 340 DL (with the 4-cyl N/A Renault Diesel engine, 5-speed manual, RWD) - sold (I wish I did not have to...)

Definition for Stupidity: Doing the same thing over and over and expecting different results...
User avatar
regent
Forum Member
Forum Member
 
Posts: 742
Joined: 23 Feb 2010, 01:34
Location: USA
Model and Year: 2002 S60 2.4

Symptoms of a bad brake booster?

Postby jblackburn » 07 Mar 2012, 23:00

I've heard people say changing their blinker fluid makes a huge difference as well ;)
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
User avatar
jblackburn
MVS Moderator
MVS Moderator
 
Posts: 13631
Joined: 08 Jun 2008, 21:54
Location: Alexandria, VA
Model and Year: 1998 S70 T5

Re: Symptoms of a bad brake booster?

Postby regent » 07 Mar 2012, 23:24

Well, mine was a very easy fix. I replaced the brake fluid and voila! (Almost forgot to mention one little detail, while doing the fluid change, I also put in a set of new Brembos and Akebono ceramics; they came with the kit anyhow) :lol:
2002 S60 2.4 non-turbo - lovely!
1987 340 DL (with the 4-cyl N/A Renault Diesel engine, 5-speed manual, RWD) - sold (I wish I did not have to...)

Definition for Stupidity: Doing the same thing over and over and expecting different results...
User avatar
regent
Forum Member
Forum Member
 
Posts: 742
Joined: 23 Feb 2010, 01:34
Location: USA
Model and Year: 2002 S60 2.4


Return to Volvo 850, S70, V70, C70 & V70-XC Forum (1992-2000)

Who is online

Users browsing this forum: Bing [Bot], deepsouth, floodcity1, Google [Bot], Jazzop, jblackburn, JRL, kevin_r, Matty Moo, RussB, volvo_mania and 139 guests