3 line brake chambers

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3 line brake chambers

Postby V8Brockway361TL » Tue Mar 12, 2019 3:12 pm

Was wondering how many people have come across 3 line brake chambers in the past. Definitely White trucks ( 60s era) had these and i think some early Brockway's did. When releasing the parking brakes it also required a minimum of a 90 pound application on the foot pedal to release the brakes. If you did not do the foot application you could feel the brakes dragging. Never had any experience with them other than a driver. But looked like there were 3 air lines going to the chambers. In my own mind thought the 90 pound application helped to push parking brake side back. Stan probably has had experience with these. Thanks Frank
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Re: 3 line brake chambers

Postby Huskiedrive2 » Tue Mar 12, 2019 8:43 pm

Well Frank, I'm sorry. In 43 years of messing with these trucks I've never heard of a 3 line brake chamber. You mentioned applying the service brake to assist in releasing the park brake. That would require a service air line which as we know is one of the two lines on current production chambers. I can't get my head around what the third line could be, unless in might possibly be an exhaust line if the quick release valve were built into the chamber. Single action chambers and piggyback chambers with a parking brake function have looked pretty much the same since the '40's. Single action first of course and then piggyback in the '60's. I you find any information, please share what you find.
Last edited by Huskiedrive2 on Wed Mar 13, 2019 11:16 pm, edited 1 time in total.
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Re: 3 line brake chambers

Postby V8Brockway361TL » Wed Mar 13, 2019 7:31 pm

Without a doubt there was instructions near the traditional looking parking brake button telling you to make the minimum 90 pound application. Of course I tried it without doing it to see what would happen and you could feel you didn't have a 100% release. Then I would step on it and unit rolled free. I almost 100% sure there was 3 lines going to chambers but never had the opportunity to get underneath. Our White's had them and I thought a couple of our 60 era Brockways had them. Thanks Stan
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Re: 3 line brake chambers

Postby fuller10b1120 » Wed Mar 13, 2019 9:20 pm

this brake systemis the dd3 system found on most bus
es I cant type i know the system 207 512 0039 aimenyt
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