The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

C900 Bulletin Board
1979-1993 & 94 Conv [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main C900 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
ABS problem and solution (long)
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by George Davis [Email] (more from George Davis) on Fri, 23 Jan 2004 12:39:02 Share Post by Email
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

I have found little info anywhere on this particular problem, so I'm posting this for future reference. Our 1991 900, equipped with antilock brakes, began pulling sharply to the left under hard braking (but not hard enough to activate the ABS). After rebuilding both front calipers, I found that the right-front brake could not be bled; fluid barely came out of the bleed nipple when the pedal was depressed. Left front was normal, lots of fluid. The problem turned out to be the ABS valve block (modulator?) bolted to the inner fender. Replacement of the valve block solved the problem.

This system (Teves Mark II ABS, I believe) has a 3-way split: right front, left front and rear. Presumably, the right front circuit was blocked inside the valve block, resulting in no braking at right front wheel, which caused the car to pull left.

Diagnosis involved loosening the input lines from the m/c and noting that equal amounts of brake fluid came out on both front brake circuits when the pedal is pushed. However, at the output lines, the left front circuit pumped out a lot of fluid, while the right front circuit only dripped.

Pipes from m/c to valve block numbered 1-4, with 1 being closest to the inner fender panel:
1 - left front
2 - fluid return to reservoir (larger diameter pipe)
3 - rear
4 - right front
Pipes out from valve block to calipers, numbered 1-3, with 1 being closest to inner fender panel:
1 - left front
2 - rear
3 - right front

I've found a lot of good information on this site (thank you!); I hope this is useful to someone.

posted by 159.121....
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!