30yearoldjunk Posted July 20, 2012 Share Posted July 20, 2012 (edited) I bought a DM685 and it has hydraulic disc brakes on the front axle. We've never seen such. Are these common? Bad news? No brake fluid leaks, so I guess they're ok. Edited July 20, 2012 by 30yearoldjunk Quote Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/ Share on other sites More sharing options...
slpwlker Posted July 20, 2012 Share Posted July 20, 2012 Never seen such an animal. Is it factory? Quote Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129668 Share on other sites More sharing options...
j hancock Posted July 20, 2012 Share Posted July 20, 2012 I went to an auction about 8 years ago and there was a very early DM815 that was hydraulic brakes all the way around. Caught me off guard because you just don't expect to see a set up that way. Belonged to a family that was involved with house moving.Jim Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129669 Share on other sites More sharing options...
ThaddeusW Posted July 21, 2012 Share Posted July 21, 2012 I assume air over hydraulic brakes? An odd setup for an american truck, popular on European trucks like early Renault trucks sold here by Mack. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129732 Share on other sites More sharing options...
30yearoldjunk Posted July 21, 2012 Author Share Posted July 21, 2012 (edited) I'll do a little more looking. I was really caught off guard when I went to check the slack adjusters.... Edited July 21, 2012 by 30yearoldjunk Quote Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129741 Share on other sites More sharing options...
Olivetroad Posted July 21, 2012 Share Posted July 21, 2012 What did it have for brakes on the rear? Quote Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129763 Share on other sites More sharing options...
30yearoldjunk Posted July 21, 2012 Author Share Posted July 21, 2012 Olivetroad, it has ordinary every day (to me anyway) air spring brakes. Quote Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129785 Share on other sites More sharing options...
theakerstwo Posted July 21, 2012 Share Posted July 21, 2012 This was a common thing with mack and also ford had the same set up on the 20000 axles. I have never understood the purpose of this. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-129789 Share on other sites More sharing options...
ThaddeusW Posted July 23, 2012 Share Posted July 23, 2012 I went to an auction about 8 years ago and there was a very early DM815 that was hydraulic brakes all the way around. Caught me off guard because you just don't expect to see a set up that way. Belonged to a family that was involved with house moving.JimYou know I just remembered that Mack had air-over-hydraulic wedge brakes on some of their 80,000 rears. The hydraulic brakes might have been heavy wedge brakes. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-130033 Share on other sites More sharing options...
30yearoldjunk Posted July 23, 2012 Author Share Posted July 23, 2012 This was a common thing with mack and also ford had the same set up on the 20000 axles. I have never understood the purpose of this.tuCool. Maybe I have a 20000# front axle, and 44000# rears. Good truck. Thanks y'all! Quote Link to comment https://www.bigmacktrucks.com/topic/26339-77-dm-with-hydraulic-disc-brakes-on-front-axle/#findComment-130062 Share on other sites More sharing options...
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