Doug&Deb Posted August 30, 2019 Report Posted August 30, 2019 I’m sure this has been gone over numerous times but please bear with me. I was looking at scarebirds website and I’m wondering what the residual pressure valve is in the MC. Quote
casper50 Posted August 30, 2019 Report Posted August 30, 2019 call them and ask them. Straight from the horse's mouth. Quote
Plymouthy Adams Posted August 30, 2019 Report Posted August 30, 2019 PER THE RULE OF THUMB rodding guidelines....most all masters with drums vary from about 5 to 12 lbs. Most disc brakes outlets from the masters have no residual...why you buy specific master or at least modify them per your need. If going dual reservoir master front disc and rear drum, you can leave the 10 in place on the rear as it is beneath the exit port and if you are placing this master under the floor then you will need to put a 2 lb to the front calipers anything over and you will have the pads continuing dragging and quick wear, heat, excessive dusting etc etc ....if you go 4 wheel disc and keep the master below the floor the 2 and 2 will apply... Quote
Doug&Deb Posted August 30, 2019 Author Report Posted August 30, 2019 I think I understand but I’m still not sure what the valve in the original mc looks like. Quote
Plymouthy Adams Posted August 30, 2019 Report Posted August 30, 2019 IF your master you are going to use has screw in adapter for the output to the brakes...the residual, if equipped will under this fitting and pushed into the master exit port itself..this pic may or may not be of help but here it is anyway....this one does not show a line adapter on the master....direct line fit evidently.... Quote
Adam H P15 D30 Posted August 30, 2019 Report Posted August 30, 2019 Circled in red... I just took mine out and never installed any in line valves. Been running like that for years with no issues... Quote
casper50 Posted August 30, 2019 Report Posted August 30, 2019 I have all 4 discs and did the same as Adam. No problems in 2 years now. Quote
Plymouthy Adams Posted August 30, 2019 Report Posted August 30, 2019 (edited) Adam's picture is correct for stock master.....most folks upgrading usually go for split system twin reservoir for added safety and why I posted the picture above....as most folks are not aware of the residual valve location on that style master cylinder......SO...…….added note...….if you are retaining the use of your stock master...the residual must come out....else the calipers will not pull away....at that time you will need to plumb to the rear an inline 10lb residual and a 2 lbs residual for the front calipers..... Edited August 30, 2019 by Plymouthy Adams Quote
Doug&Deb Posted August 30, 2019 Author Report Posted August 30, 2019 Thanks everyone, now I have a better understanding. I’ll have to think about this. Quote
casper50 Posted August 30, 2019 Report Posted August 30, 2019 Doug as I said I never put any valves on or in my stock MC. has been working just fine. Quote
Plymouthy Adams Posted August 30, 2019 Report Posted August 30, 2019 3 hours ago, casper50 said: Doug as I said I never put any valves on or in my stock MC. has been working just fine. I would venture to guess if you are using the stock master in the stock location beneath the floor and did not install a two lb residual that your very vent that is in the corner of your master cylinder fill cap is plugged up and preventing venting else that would lead to gravity flow from the caliper and spongy pedal as a result..... Quote
casper50 Posted August 30, 2019 Report Posted August 30, 2019 new cap put on last year, MC in the stock place. Quote
Doug&Deb Posted August 30, 2019 Author Report Posted August 30, 2019 Casper50, front discs only? Quote
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