Brake Issue

[jmitro]

with everything you've done trying to sort out the problem, it would be cheaper just to take it to a shop for repair. you don't need to pay dealership rates; there's lots of independent shops in Houston

[Peenkie39]

Originally Posted by jmitro

with everything you've done trying to sort out the problem, it would be cheaper just to take it to a shop for repair. you don't need to pay dealership rates; there's lots of independent shops in Houston

i am having the same issue with my 1998 Boxster. we replaced brake lines, calipers rotors and the master cylinder. Today all 4 wheels locked up on me just barely made it home. Only thing we haven’t replaced is the brake booster. Did you find a solution your problem?

[gabedrummin]

Replacing master cylinder , rear calipers , rotors and all brake lines , pads pulled all the lines off abs pump blew compressed air thru all the lines , vacuum bled system fixed my problem .

[ALEX SOL]

did the op of this thread find the solution to his brake system issues?

I'm having same issues of rear brakes locking up and cannot bleed the system,

thinking to replace the original rubber brake lines... then look at abs pump, then maybe booster though it's acting properly..

my test for the booster? turn off car, pump the brake and it would go from 3/4 travel, second pump 1/2 the travel, third pump of the brakes 1/3 travel.... suspect it's not the booster

i have 2000 boxster S with 65,000 miles on it

blow out abs pump is the next step

[gabedrummin]

I replaced the rubber lines with stainless .Replaced both rear calipers .Replaced the master cylinder . I removed all the hard line from from the ABS Pump and with the lines disconnected at the rear blew compressed air thru all the lines . Put everything back together and my brakes have been fine ever since doing this.

[ALEX SOL]

so good to hear your fix worked out and still going strong after four/five months... i had same/similar symptoms to the point my brakes were glowing red hot and rear brake wear indicator(s) were on fire... shopping for a used abs unit... what dies on these units? looking through the schematics, they seem very simple. rigging up a micro computer to open and close the valves to clear out any gunk... and my unit looks like it came out of the showroom. unlike the rest of the car!!

[78F350]

I've had a '99 and '04 that had corrosion in the brake booster. The brakes would stick and drag, but also the pedal would stay part way down. It sounds like your pedal is working normally, so I'm thinking ABS unit as well. Probably no help, but here's the Booster replacement.

[ALEX SOL]

super advice... after checking fluid at the master cylinder, abs unit and rear calipers, i found the front caliper is working as expected. pump and hold the brake and the juice flows out of both sides of the front calipers.

pump and hold the rears and i get some fluid like a trickle to the passenger side rear outside bleeder only and none on the inside, and on the driver's side rear bleeder absolutely none...

so thinking i'll blow out the lines - following advice from above posting reply and blow out the lines all the way to rear and rebuild the rear calipers - fresh piston seal and dust cover, silicon grease so as to not damage the rubber seals

if that's doesn't get the brake juice flowing, i'll look at abs unit... cracked all the six lines on the abs unit - 2 x 13mm and 4 x 11mm and all six had good flow from the master cylinder, i didn't crack the four 11mm that feed the four calipers yet...

I did have good flow from the rear rubber lines (one each side) with rear calipers disconnected and used a m10x1.0 pitch bolt and chunk of rubber so i'd have brakes enough to safely drive the boxster around the corner to my storage - running no rear brakes and only the fronts... spongy as it's difficult to fully bleed the system with this set up!! And actually had decent braking from the front brakes only... must be the four pistons fronts!!