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03-31-2020, 02:14 PM
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#1 |
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Registered User
Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 228
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Brake warning switch
There is a Brake Warning Switch on the brake balancer block of my truck with a Tan wire attached to it. This goes to a warning light on the dash.
What is this light meant to say?
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
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03-31-2020, 02:50 PM
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#2 |
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Post Whore
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,393
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Re: Brake warning switch
The light will come on when one of the brake circuits isn't making as much pressure as the other one. So normally when you step on the brakes the front and rear brakes both make approximately the same pressure. Inside of the Proportioning Valve is a spool (Pressure Differential Valve in picture) that will shift away from the side with pressure to the low pressure side if the pressures are not equal.
So if the rear axle hose breaks then then pressure won't build in that circuit. Then the spool inside of the Proportioning Valve shifts and grounds the tan wire and the light lights. Warning you that something is wrong with the brakes. Note this is not a drawing of a Proportioning Valve normally found on our trucks.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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03-31-2020, 03:24 PM
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#3 | |
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Registered User
Join Date: Feb 2019
Location: Centurion, Gauteng, South Africa
Posts: 228
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Re: Brake warning switch
Quote:
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Best regards, Philip Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp ) Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12 |
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03-31-2020, 04:00 PM
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#4 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,393
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Re: Brake warning switch
You are welcome!
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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03-31-2020, 04:54 PM
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#5 |
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Senior Member
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,852
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Re: Brake warning switch
To add to HO455's great description, here's what the '69 owners manual says.
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Jim |
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