Hi Everyone,

I replaced the rear wheel cylinders on my 1990 F150, and am trying to bleed the brakes, but I keep getting air.

I refill the plastic master cylinder reservoir as needed, but I notice that the reservoir appears to be divided into 4 chambers from front to back, and the two middle chambers do not seem to be taking any fluid when I pour it in (even though the reservoir cap is right over the top of those middle chambers). I think those low chambers are letting air into the system.

Only the very front and rear chambers are accepting any fluid.

Does anyone have any suggestions?

Thanks!