I have a Herald with drums all round. After a longish trip (about 80miles), the next day the brake pedal went straight to the floor. I found 3 of the 4 cylinders at the front were leaking. I've ordered new cylinders from Rimmers, but I wondered if there was anything else I should check out. The run the previous day was quite up and down with a lot of brake use, but I didn't expect this.