Inconsistent brake pedal feel

[burlsube]

On my new to me '96 FJ80 the brake pedal is rather inconsistent. It starts off as soft, with a few pumps it becomes "normal" until the brake pedal is depressed then it falls and becomes soft.

The previous owner says this is normal for FJ80s, I suspect something else is up. The past records says that the master cylinder was replaced. What else good be up?

Thanks!

 

[BILT4ME]

On my new to me '96 FJ80 the brake pedal is rather inconsistent. It starts off as soft, with a few pumps it becomes "normal" until the brake pedal is depressed then it falls and becomes soft.

The previous owner says this is normal for FJ80s, I suspect something else is up. The past records says that the master cylinder was replaced. What else good be up?

Thanks!

I would bleed the system a LOT following the FSM order.

RR
LR
LSPV
RF
LF
LSPV

Yes, LSPV twice.

Best with a partner or a bleeder system.

 

[KC masterpiece]

It starts off as soft, with a few pumps it becomes "normal" until the brake pedal is depressed then it falls and becomes soft.

I think they have pills for that now.

 

[Godwin]

With the master cylinder being replaced the new one may have just been slapped on instead of checking and adjusting for the proper depth of the brake booster push rod into the cavity in the end of the master cylinder.