BC Mack Posted March 2, 2014 Share Posted March 2, 2014 Just sounding you old truckers out.....when spring parking brakes (maxi's) were new to trucks they were operated by a lever on the dash, correct?... that in turn became the yellow knob...easy so far.the picture below illustrates the knob I am familiar with... read the instructions carefully...my question... did this method of operation ever appear in the truck industry...?BC Mack Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/ Share on other sites More sharing options...
doubleclutchinweasel Posted March 2, 2014 Share Posted March 2, 2014 Interesting! That could throw you for a loop! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235203 Share on other sites More sharing options...
gearhead204 Posted March 2, 2014 Share Posted March 2, 2014 b.c.m. where did you find that. I've used one like that before but now I cant remember if it was in a truck or a piece of construction equipment......of all the things I've misplaced I miss my mind the most! Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235211 Share on other sites More sharing options...
BC Mack Posted March 2, 2014 Author Share Posted March 2, 2014 here is a photo of the side panel... the black button you also won't find in a truck anyone wish to hazard a guess what this is from? I am still interested to find out if a 'push to park' was ever a standard fit in a truck thanks BC Mack Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235292 Share on other sites More sharing options...
gearhead204 Posted March 2, 2014 Share Posted March 2, 2014 off road haul truck ? Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235313 Share on other sites More sharing options...
j_martell Posted March 2, 2014 Share Posted March 2, 2014 Interesting! That could throw you for a loop!You said it!!! There would be LOTS of cuss words coming outta my mouth....lol Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235363 Share on other sites More sharing options...
siding guy Posted March 3, 2014 Share Posted March 3, 2014 I remember Kenworth were set up that way in the late 70's early 80's Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235365 Share on other sites More sharing options...
39 Baby Mack Posted March 3, 2014 Share Posted March 3, 2014 We had a '64 VCO International that was like this.I think the only reason it was like this was because they used a Sealco valve to control the spring brakes rather than a Bendix.They both do the same job just work backwards from each other.Ron Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235375 Share on other sites More sharing options...
BC Mack Posted March 3, 2014 Author Share Posted March 3, 2014 and the answer is....... Transit Bus..!!! an option from many manufacturers that seems to be chosen by most operators, I've seen them in our fleet from current deliveries back to early 80's... why?... still digging into that. Heard lots of conjecture. the reason I asked about being installed on trucks is that one of the stories I was given was that there were a standard fitment at one time until an incident where a second driver climbed out of the bunk when at speed and his foot hit the yellow knob therefore applying the park brake with interesting results.... urban legend? I'm trying to find a report or legislation but it doesn't seem to be out there, or I just can't find it.... at work it is simply "a transit thing".... as for the black button... emergency air.... if maxi's apply due to loss of air, pressing and holding the black button while releasing the park brake will allow the bus to be moved. Quite tricky to do with one hand and having an automatic helps. as '39 baby mack' states it is a Sealco vs Bendix situation... Bendix is firmly in the 'pull to apply' market. any insights welcome.. BC Mack Quote Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235382 Share on other sites More sharing options...
rsb502 Posted March 3, 2014 Share Posted March 3, 2014 About half of our RR maintenance of way equipment is set up with sealco valves like this, the other half are the standard Bendix push to release valve. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/34872-park-brake-question/#findComment-235385 Share on other sites More sharing options...
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