GOOD IDEA REYNALDO SPECIALY IF IT WAS PURCHESED AT AUTO ZONE REPLACE IT TRY THAT IF NOT LET ME KNOW OK
Get another master cylinder,If you want to really find out if the master cylinder is goo open one of the lines have someone pump the brake,with your finger over the open cylinder line you will have pressure coming out, and if you feel vacuum has your assistant releases the pedal that a sure sign the master cylinder is not working,Also when you have a master cylinder before you install you need to bench bleed it
SOURCE: soft brake pedal after replacing shoes,drums,wheel
YOU STILL HAVE AIR IN BRAKE SYSTEM REBLEED BRAKE SYSTEM.
SOURCE: 1999 Chevy Tahoe- Soft Brake Pedal
Try having the dealer flush and bleed your system. It is very hard to bleed ABS systems yourself and have safe brakes that still work afterward. Bleeding non-ABS brakes yourself is easy not the same for ABS brakes. Valving, sensors and what-not require a tech and the correct equipment in my opinion. You do it wrong and you could ruin your ABS system. Do that and see if they firm up. I replaced my brake shoes/pads at the same time all new everything in back, drums/springs everything and new rotors up front. then I had the chevy dealer flush, refill and bleed system. Stiffer pedal and brakes work better. Keep in mind the brakes on 99 Tahoes are inaedequate, require new rotors often, heat up and fade/glaze pads regularly. I replace my pads long before they wear down because they glaze up and start fading early. I'll rough em up once maybe, next time, new ones. Every two brake jobs, new rotors for me. Just how it is. They will stiffen a bit and work better but they will never be awesome brakes. Just how it is on 99 and earlier Tahoes. Hope it helps. Very important to bleed correctly though. I'll bleed my 83 Toyota 4x4 myself but not the Tahoe.
SOURCE: 1999 Ford E350 van problem:
Good question, on the antilock system is a bleader too and bleade it the same way you bleade the caliper. After all is done adjust the rear brakes, they should have a drag to them.
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