93 S10 Blazer brake pedal goes to floor slowly

[gpmodelj70]

Please offer some guidance...93 Blazer...brake pedal slowly goes to the floor when pressed...no fluid leaks and I don't ever have to add fluid...I replaced the master cylinder (bench bled properly)...no help...bled the system at each wheel...no help...I don't know what else to try...

[MT-2500]

Originally Posted by gpmodelj70

Please offer some guidance...93 Blazer...brake pedal slowly goes to the floor when pressed...no fluid leaks and I don't ever have to add fluid...I replaced the master cylinder (bench bled properly)...no help...bled the system at each wheel...no help...I don't know what else to try...

Did you place with a new or rebuilt or used cylinder?

Does it have a full brake pedal with engine off?
Are rear brakes adjusted up good?

On the going to floor is that with engine running or engine off and hard or light push?

[gpmodelj70]

Was replaced with a rebuilt.
I did not try it with engine off...good idea...will try.
I have not looked at the rear brakes other than to check shoes a few months ago.
With engine running and applying the brake, I notice immediately that the pedal goes farther than it used to and will slowly go to the floor.

[MT-2500]

Originally Posted by gpmodelj70

Was replaced with a rebuilt.
I did not try it with engine off...good idea...will try.
I have not looked at the rear brakes other than to check shoes a few months ago.
With engine running and applying the brake, I notice immediately that the pedal goes farther than it used to and will slowly go to the floor.

Does it have rear Weel or 4 wheel ABS brakes
Always make sure rear brakes are adjusted up good.
If air has got into ABS unit it willo also need to be bleed out.

Confirm good full solid pedal engine off.

[gpmodelj70]

Originally Posted by MT-2500

Does it have rear Weel or 4 wheel ABS brakes
Always make sure rear brakes are adjusted up good.
If air has got into ABS unit it willo also need to be bleed out.

Confirm good full solid pedal engine off.

I don't know whether 4 wheel or 2 wheel anti lock...there are two bleeder fittings on the ABS unit so I would assume 4 wheel?...fluid will only bleed from one of them...I will check the rear brakes...is there a procedure for bleeding the ABS unit or is it as simple as it looks?...pedal leaks down with engine off also....it leaks down at the is rate...sitting at a stop sign and if I have to wait for 5 cars to go by I have to take my foot off of the pedal and press it again.

[MT-2500]

Originally Posted by gpmodelj70

I don't know whether 4 wheel or 2 wheel anti lock...there are two bleeder fittings on the ABS unit so I would assume 4 wheel?...fluid will only bleed from one of them...I will check the rear brakes...is there a procedure for bleeding the ABS unit or is it as simple as it looks?...pedal leaks down with engine off also....it leaks down at the is rate...sitting at a stop sign and if I have to wait for 5 cars to go by I have to take my foot off of the pedal and press it again.

If the ABS unit has got air in it you will need a capable ABS scanner and holder tools to bleed it.