Hi Folks,
I did the swap to the later model model front brakes in my 89 wagon and it works fine except the front brakes lock up in an emergency stop. I know many others have said that they had no problems after the swap but I most certainly do. I do not even want to drive it in the rain.
I went to look at the proportioning valve and find there is none, at least not exactly.
There is a "Pressure Control Valve". From the service manual.. "The valve is screwed into the master cylinder. It limits the pressure level at the rear brakes to minimize rear wheel skidding during hard braking. The sedan and station wagon use the same valve."
There is also a "Metering Valve". ... The metering valve limits the hydraulic pressure to the front disc brakes untill a predetermined front hydraulic pressure has been reached. The valve has a bleeder rod for purging the front brake system after performing brake service. Refer to Hydraulic System Bleeding."
So it seems to me that there is really only a limiter for the rear brake pressure which screws into the master and then there is a valve for the front that keeps the pads from rideing the rotors untill a certain amount of pressure is applied.
So what to do?
I could try to add an adjustable valve between the master and the metering valve. That would allow me to reduce the pressure to the front brakes.
I could try to disable the pressure control valve and add an adjustable valve between the mc and the splitter for the rear brake line at the differential thus increasing the pressure to the rear brakes.
I could rip out the front upgrade and go back to pre 98 brakes.
At first blush increasing the pressure to the rear sounds good except that I wonder if that will just achieve easier lock up of all four wheels.
This is something I really need to take care of quickly though my plate is full and can not afford the extra time working on the wagon right now.
I did the swap to the later model model front brakes in my 89 wagon and it works fine except the front brakes lock up in an emergency stop. I know many others have said that they had no problems after the swap but I most certainly do. I do not even want to drive it in the rain.
I went to look at the proportioning valve and find there is none, at least not exactly.
There is a "Pressure Control Valve". From the service manual.. "The valve is screwed into the master cylinder. It limits the pressure level at the rear brakes to minimize rear wheel skidding during hard braking. The sedan and station wagon use the same valve."
There is also a "Metering Valve". ... The metering valve limits the hydraulic pressure to the front disc brakes untill a predetermined front hydraulic pressure has been reached. The valve has a bleeder rod for purging the front brake system after performing brake service. Refer to Hydraulic System Bleeding."
So it seems to me that there is really only a limiter for the rear brake pressure which screws into the master and then there is a valve for the front that keeps the pads from rideing the rotors untill a certain amount of pressure is applied.
So what to do?
I could try to add an adjustable valve between the master and the metering valve. That would allow me to reduce the pressure to the front brakes.
I could try to disable the pressure control valve and add an adjustable valve between the mc and the splitter for the rear brake line at the differential thus increasing the pressure to the rear brakes.
I could rip out the front upgrade and go back to pre 98 brakes.
At first blush increasing the pressure to the rear sounds good except that I wonder if that will just achieve easier lock up of all four wheels.
This is something I really need to take care of quickly though my plate is full and can not afford the extra time working on the wagon right now.
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