Brake Light Switch - SaabCentral Forums
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum

Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Workshop

C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum. is the premier Saab All Forum on the internet. Registered Users do not see the above ads.
Thread Tools Display Modes
Old 3rd May 2004
Orca Orca is offline
Saab Lunatic
Join Date: Mar 2003                                                
Location: ܁
My Saabs: ܁
Posts: 4,222
Default Brake Light Switch

How long should the plunger on the brake light switch be? The reason I ask
is my brake switch has turned hair-trigger on me yesterday and consequently
boost cut over anything other than a perfectly smooth road. I found I had
to pull the brake pedal up with my foot otherwise the brake lights would
stay on and basic boost situation on the turbo.

I removed the brake light switch and inspected it. The plunger was about 4mm
long and given a little jimmying seemed to pop out and bit more, expending
it to about 6mm long. I re-fitted the switch and it was okay for a while,
but returned to a hair-trigger action within a few minutes of driving.

I read in the Haynes that there should be 10mm travel on the brake pedal
before the switch would click, so I packed up the flange that holds the
switch closed with a 5mm shim. This seems to have done the trick, but I
can't help thinking that the plunger on the switch should be longer and
therefore more travel on the brake pedal would be required to unload the
switch, causing the brake lights to operate.

To return to my question: How long should the plunger on the brake light
switch be? Do I need a replacement?

BTW, I don't have cruise control - there's only one switch down there in my Orca.
Reply With Quote Quick reply to this message
Sponsored Links
Old 3rd May 2004
gerryp's Avatar
gerryp gerryp is offline
Saab Crazy
Join Date: Dec 2003                                                
Location: '88a c900t16s Harlow, UK
Posts: 506

WD40 - the cure for all ills of this sort. 8)
Reply With Quote Quick reply to this message
Old 3rd May 2004
john-w's Avatar
john-w john-w is offline
Saab Lunatic
Join Date: Aug 2001                                                
Location: Bulphan, Essex.
My Saabs: 1989 T8 Special
Posts: 3,467

You can sort of flick the switch to get the plunger to come out on it's splines, it must be some sort of interference fit. I just put my switch back on and the force of the pedal returning self-adjusted the switch plunger to the correct length!
Reply With Quote Quick reply to this message
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 11:00 PM.

Powered by vBulletin® Copyright ©2000 - 2017, vBulletin Solutions, Inc.

top of page | sitemap | email us

copyright © 2003 - 2011, All rights reserved - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.