Hi if if fluid in lines expands it simply backs into master cylinder on non ram j/k drum brakes --even with a residual pressure valve , it cannot hold the brakes to drum ? is there a residual pressure valve in these non ram stock ? Also issue of hydrovac on ram cars . If a master "for a 300"-- the common one --w residual pressure is used as the master drive to hydrovac it will actuate the hydrovac by itself leading to locking . Probably caused by expansion in connecting line. That might be happening if this is a ram car. I believe with hydrovac you have to have a special no residual valve master or remove it. Same thing happens on non ram when you take foot off brakes. It runs back in, non ram. If it locks up on touching that has to be a booster engagement problem, as there is simply no way to generate enough psi to lock brakes unless booster is active. Over active .
I agree given two instances --high temp must cause it , but somehow by impacting booster or on non ram the trigger adjustment. Perhaps heat impacts an adjustment that is very critical and not set correctly ?? as I understand it they say in FSM not to ever touch the trigger adjustment. To many that is a blank invite to go right at it . As by definition, they know far more than FSM and guys who designed it . If ram car, might have the wrong master .
Not running well on hot days w j manifolds almost says too much carb heat getting up there . On highway even more gas flow under carb would still keep carb too hot . On hot day . George used to restrict that flow , thin metal plate in elbow , Don Cole did too . Don had a very fast K , blocked heat . He might chime in .
Sent from my iPhone> ------------------------------
> On Jun 18, 2017, at 2:14 PM, 'David Schwandt' finsruskw@xxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@yahoogroups.com > wrote:
>
> Simple....Too much under hood heat, heating the brake system DOWNSTREAM from
> the M/C, expanding the fluid in the lines, just enough to have the same
> effect as riding the brakes. Expect it to happen again even w/the new parts.
> Add an electric fan to help move the hot air and/or crack the hood open
> letting it catch on the 2nd catch
> Rams by any chance w/ stock headers???
> I have the same issue w/my F (had J/K headers) in high heat conditions.
> Won't run worth a crap when temps are in the 90's, even at highway speeds.
> The trip home from McCungie was a nightmare 2 years ago.
> Good luck!!
> Dave Schwandt
>
>
> -----Original Message-----
> From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@yahoogroups.com ] On
> Behalf Of samacisaac@xxxxxxxxx [Chrysler300]
> Sent: Sunday, June 11, 2017 3:08 PM
> To: Chrysler300@xxxxxxxxxxxxxxx
> Subject: [Chrysler300] Parade issues
>
> Drove my 64 300 in a parade yesterday, aftermarket temp gauge went off the
> scale but wasn't puking water or boiling over, main concern was 1/2 way thru
> had brake issues, started acting like brakes were dragging, although I never
> smelled them (tranny tightening up maybe?) and lost the power brakes, pedal
> got rock hard and when brake was applied she wanted to launch you thru the
> windshield. (New master cylinder and booster, less than 150 miles on them)
> Today she's fine. Any ideas?
>
> Sent from my iPhone
>
>
> ------------------------------------
> Posted by: samacisaac@xxxxxxxxx
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> Posted by: "David Schwandt" <finsruskw@xxxxxxxxxxxxxxx>
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