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with the pushrod in the manual position- it becomes "easier" to push the pedal down- it will also be "easier" for the booster to assist- so if you were to drill the pedal arm for manual position in a pwr brake setup- i would imagine, once the pedal moved enough to activate the vacuum shuttle valve and engage power boost- it would probably push the pedal right down without footwork- considering the lower amount of resistance allowed by the leverage advantage of the manual pedal:piston travel ratio- or at least make the car real jerky trying to stop....
-----Original Message-----
From: Eastern Sierra Adjustment Svc <esierraadj@xxxxxxxxxxx> To: L-FORWARDLOOK@xxxxxxxxxxxxx Sent: Wed, Feb 10, 2010 3:10 pm Subject: Re: [FWDLK] Hissy-fitting brake booster
I kinda suspected that there would be a pedal travel difference between
manual and power braking systems. I wonder how the manual brake pedal position would affect the application-operation of the power brakes? Seems like an easy-enuf project/experiment.... Neil Vedder Jan & Roger van Hoy wrote: > The pedal travel is less on a power brake unit of that vintage; if you > put that linkage on a manual system you may run out of travel and the > pedal hit the floor before stopping the car. Even if you resolve that > problem, it might require two-foot braking to achieve sufficient > pressure on the master cylinder to stop the car. > > --Roger van Hoy > > > ----- Original Message ----- From: "Eastern Sierra Adjustment Svc" > <esierraadj@xxxxxxxxxxx> > To: <L-FORWARDLOOK@xxxxxxxxxxxxx> > Sent: Wednesday, February 10, 2010 12:36 PM > Subject: [FWDLK] Hissy-fitting brake booster > > >> Well, for anyone interested, you might recall that my car's >> canister-type power >> brake booster has been hissing badly, whenever the pedal is >> depressed, and >> that I'd been quoted O/H prices of several hundreds, and up, for >> that work. >> >> When this condition occurs, with our cars, a mere reversion to manual- >> braking-effort results, and if so, that is NO big-deal, believe me. >> Biggest >> PITA is the hissing noise, at red lights (so, don't STOP there, I hear >> you say). >> >> As I never like risking sending out an essential part with the car >> remaining >> undriveable, I bought a flea-pay booster, very economically, which >> was claimed >> to be in working condition, and sent it out to "Booster Dewey", in >> Portland OR >> for O/H, at the VERY reasonable cost of $175.00. >> >> They just called and will be returning that guy to me; they say that >> they use a very >> viscous lubricant to seal up the booster's internal compression. >> >> I've asked them to send me some pics of their representative internal >> work, as I may be >> praising their product to others. They say that my 'new' booster has >> been tested by >> them to work like a champ! >> >> So, I may be interested in selling my car's canister to someone who >> might be interested >> in having IT be O/H'ed, and installed in (one of-) your car(s), too. >> >> Anyway: and here's a question for you Engineering-types: the manual >> brakes apparently >> have a different configuration of the brake pedals/system, from the >> power brake models (called >> the "aspect ratio"--IIRC) which allow for different p.s.i. line pressure >> ratings, between the two >> systems. >> >> E.G.: according to the 1957 D501 A.M.A. specs, the manual brakes have a >> 750 p.s.i. >> rating, while the power brakes have a 1,100 p.s.i. rating ; a >> considerable difference. >> >> (Here it comes: ) so, to what extent would a manual brake car realize >> an increase in >> braking effort/effect if a power brake's pedal-lever-connections were >> to be installed >> onto it, and, vice-versa---given, that the master cylinders are >> identical, which I >> believe that they are???? >> >> >> Neil Vedder >> >> >> >> >> ************************************************************* >> >> To unsubscribe or set your subscription options, please go to >> http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1 >> > > > -------------------------------------------------------------------------------- > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.435 / Virus Database: 271.1.1/2676 - Release Date: > 02/08/10 19:35:00 > > ************************************************************* To unsubscribe or set your subscription options, please go to http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1 ************************************************************* To unsubscribe or set your subscription options,
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