Do M915s have anti compounding valves?

[Castle Bravo]

I have been unable to find this information in the TMs. Do M915 series trucks series trucks have anti compounding valves?

This link explains compounding better than any I've come across so far - http://www.truckt.com Air Brakes Anti-Compounding Theory

The TM does not say anything about avoiding applying the service brakes when the parking brakes are engaged, so that leads me to believe they do.

As a further question, do M939 series trucks have anti compounding measures? Do wedge brakes have compounding issues?

 

[Stan]

Were the anti-compounding valves around when the 915s were built? Informative link, thanks.

 

[Castle Bravo]

Were the anti-compounding valves around when the 915s were built? Informative link, thanks.

I don't know. I thought I had read something about anti compounding becoming common in the late 60s, but I cannot find that information anywhere now.

 

[R Racing]

I believe they do have them !

 

[Castle Bravo]

Can anybody provide any additional information?

 

[Castle Bravo]

So I finally found something that shows that M915 trucks have anti-compounding valves. The spring brake quick release valve that is mounted on the inside of the driver's side frame rail above the middle axle has an anti-compounding feature.





http://www.haldex.com/en/North-Amer...alves/Competitive-Remanufactured/2927/289714X

Bendix service data -

http://www.plazafleetparts.com/uploads/2/1/9/0/2190100/qr-1c_service.pdf