Bleeding brakes

Hi,

If i am bleeding the brakes on a 94 corolla (non-abs) do i need to bleed at all four wheels or just at the one furthest from the master cylindar?
I am doing it just to replace the fluid which is 165k old and the pedal has become too spongey.
Should i expect fluid change alone to firm up the pedal? I expect pedal travel as opposed to spongeyness is fixed in a differant way?

Thanks for any advice/suggestions

edit: will 1 litre of DOT 4 be enough to bleed the whole system?

Our man in Havana

1 litre should be more than enough. You should bleed at all 4 wheels.

Plug

Start at the wheel furthest from the master cylinder and work your way round till the last wheel at the master cylinder.

sky6

Changing the brake fluid won't do any harm it can only improve things. Just make sure and use the correct type for your car. It's usually dot 3 dot 4 you will find the correct one marked on the top of the container bottle.
However if you have a spongy pedal ,the problem may be that you need to change the master cylinder. If changing the fluid dosen't solve your problem then you will definitely need to change the master cylinder.

Gingersnaps

A spongy brake pedal is usually a sign that there is air in the brake fluid system. Check for a leak, especially from the brake cylinders in the brake drums. If you have no leaks and bleeding the brakes doesn't sort the problem then I would suspect that the master cylinder is faulty. Excess brake pedal travel is usually a sign that the brakes need to be adjusted. Hope this helps.

Thanks guys.
Manual says dot 3 but everything i have read suggests dot 4 will be fine instead?

biko

Yes, dot3 and 4 can mix so even if it's dot3 in there now you can flush with dot4.