H70 front brakes ..What is this ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

greywuuf · 06-08-2016, 01:59 AM

Looks like a temp sender or pad thickness warning light or ??? any idea's what this used to be ?

https://www.flickr.com/photos/404389...n/photostream/

**Bob B.** · 06-11-2016, 02:20 AM

What year is your truck? I ask because around 1975 the DOT briefly required antilock brakes on all new heavy trucks and buses. Needless to say, it was a fiasco, the technology just wasn't there yet for reliable ABS on air brake equipped vehicles. Most operators removed the ABS components and replaced the complicated and failure-prone ABS control valves with standard relay valves. The sensor in your picture looks like an old wheel speed sensor.

jumpsoffrock · 06-11-2016, 11:39 PM

Quote:

Originally Posted by Bob B.

What year is your truck? I ask because around 1975 the DOT briefly required antilock brakes on all new heavy trucks and buses. Needless to say, it was a fiasco, the technology just wasn't there yet for reliable ABS on air brake equipped vehicles. Most operators removed the ABS components and replaced the complicated and failure-prone ABS control valves with standard relay valves. The sensor in your picture looks like an old wheel speed sensor.

That is VERY interesting history! Thank you for that. I'll have to read up on that. Really cool info!

Not sure if he found the year. It was a mystery at one point.

greywuuf · 06-12-2016, 12:38 AM

Very interesting indeed. the business end does indeed look like a mag sensor I just discounted that as uhm I mean really it is a 70's truck . The online serial number info I can find and the TITLE both call this a '75 chevy. However I have reason to believe it was converted to "4x4" by Fabco before delivery ... all I have left is the placards on the dash and the Dual air shifters for the transfer case... at some point it was "reconverted" so that front axle may or may NOT be original to THAT truck .

jumpsoffrock · 06-12-2016, 06:28 PM

Grey, you might just have the most perplexing and confused truck I've ever heard of.

greywuuf · 08-26-2016, 06:26 PM

Good call I guess if I had thought about it these might have been clues.
https://flic.kr/p/LrZFxn
https://flic.kr/p/L8ueZJ

jumpsoffrock · 08-26-2016, 11:49 PM

Yep, those help

I love your truck, what an amazing piece....could you imagine that thing new!?!

greywuuf · 08-27-2016, 04:58 AM

Quote:

Originally Posted by jumpsoffrock

Yep, those help

I love your truck, what an amazing piece....could you imagine that thing new!?!

Oh I have tried.....you have to squint really hard.....

06-08-2016, 01:59 AM	#1
greywuuf Registered User Join Date: Jul 2007 Location: Alaska Posts: 516	H70 front brakes ..What is this ? Looks like a temp sender or pad thickness warning light or ??? any idea's what this used to be ? https://www.flickr.com/photos/404389...n/photostream/

06-11-2016, 02:20 AM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,312	Re: H70 front brakes ..What is this ? What year is your truck? I ask because around 1975 the DOT briefly required antilock brakes on all new heavy trucks and buses. Needless to say, it was a fiasco, the technology just wasn't there yet for reliable ABS on air brake equipped vehicles. Most operators removed the ABS components and replaced the complicated and failure-prone ABS control valves with standard relay valves. The sensor in your picture looks like an old wheel speed sensor. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

06-12-2016, 12:38 AM	#4
greywuuf Registered User Join Date: Jul 2007 Location: Alaska Posts: 516	Re: H70 front brakes ..What is this ? Very interesting indeed. the business end does indeed look like a mag sensor I just discounted that as uhm I mean really it is a 70's truck . The online serial number info I can find and the TITLE both call this a '75 chevy. However I have reason to believe it was converted to "4x4" by Fabco before delivery ... all I have left is the placards on the dash and the Dual air shifters for the transfer case... at some point it was "reconverted" so that front axle may or may NOT be original to THAT truck .

06-12-2016, 06:28 PM	#5
jumpsoffrock Registered User Join Date: Apr 2014 Location: California Posts: 926	Re: H70 front brakes ..What is this ? Grey, you might just have the most perplexing and confused truck I've ever heard of.

08-26-2016, 06:26 PM	#6
greywuuf Registered User Join Date: Jul 2007 Location: Alaska Posts: 516	Re: H70 front brakes ..What is this ? Good call I guess if I had thought about it these might have been clues. https://flic.kr/p/LrZFxn https://flic.kr/p/L8ueZJ Last edited by greywuuf; 08-26-2016 at 06:51 PM.

08-26-2016, 11:49 PM	#7
jumpsoffrock Registered User Join Date: Apr 2014 Location: California Posts: 926	Re: H70 front brakes ..What is this ? Yep, those help I love your truck, what an amazing piece....could you imagine that thing new!?!



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