1989 Toyota 2WD pickup. Completely stock power brake system...
Worked normal about a month ago. Pulled passenger front line off it for about a month to send out to have new longer ones built so fluid drained from the system. Then had the master cylinder off the booster for about a week sitting on the bench while working in engine compartment. Reinstalled master cylinder dry for about a week. Then got new brake lines, installed those last night.
Bled system. Pass rear, drvr rear, pass front, drvr front in that order. Took about 12 bleeds on pass rear to go from dribbling out to actually having pressure. All the rest had pressure on first bleed. 99.9% I got all air out of the lines. Peddle pressure is great without truck running, this isn't my first time and I know what the peddle should feel like with and without air in the lines...
Start the truck so the booster kicks in and have maybe 25-50% braking power and peddle can be pushed to the floor. Re-bled system with truck running using booster system. No improvement... Peddle will hold pressure without truck running for indefinate period of time. That tells me it's not bleed by on the master cylinder. The master cylinder itself is 12-18 months old at most.
Any ideas???
Checked all fittings and lines, no leaks that I could find.
Thanks,
Khris
Oh quick edit... I do not have the load position sensor thing on the rear of my truck. I've bypassed it in my brake system as it was too limiting to my suspension travel needs. This was done probably 2 years ago though and is nothing new or changed to cause this issue...
Worked normal about a month ago. Pulled passenger front line off it for about a month to send out to have new longer ones built so fluid drained from the system. Then had the master cylinder off the booster for about a week sitting on the bench while working in engine compartment. Reinstalled master cylinder dry for about a week. Then got new brake lines, installed those last night.
Bled system. Pass rear, drvr rear, pass front, drvr front in that order. Took about 12 bleeds on pass rear to go from dribbling out to actually having pressure. All the rest had pressure on first bleed. 99.9% I got all air out of the lines. Peddle pressure is great without truck running, this isn't my first time and I know what the peddle should feel like with and without air in the lines...
Start the truck so the booster kicks in and have maybe 25-50% braking power and peddle can be pushed to the floor. Re-bled system with truck running using booster system. No improvement... Peddle will hold pressure without truck running for indefinate period of time. That tells me it's not bleed by on the master cylinder. The master cylinder itself is 12-18 months old at most.
Any ideas???
Checked all fittings and lines, no leaks that I could find.
Thanks,
Khris
Oh quick edit... I do not have the load position sensor thing on the rear of my truck. I've bypassed it in my brake system as it was too limiting to my suspension travel needs. This was done probably 2 years ago though and is nothing new or changed to cause this issue...
