The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**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.

06-11-2016, 02:20 AM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,396	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.