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/

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.

Re: H70 front brakes ..What is this ?
 

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.

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 .

Re: H70 front brakes ..What is this ?
 

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

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

Re: H70 front brakes ..What is this ?
 

:lol: Yep, those help


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

Re: H70 front brakes ..What is this ?
 

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