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I've just bought a very late W211 estate (no SBC), and it has a brake problem. The selling dealer will have to pay for the repair and claim it back from the warranty company, but I'd like to have some idea of what's likely to be involved before it goes to Terry Gates for the work.
The brakes work perfectly, and there are no dash warning lights on at all when the car is running. However, brake pedal travel is longer than I'm used to, and if I keep heavy pressure on the pedal after the car has stopped it will sink slowly and steadily to very near the floor with no increase in resistance. (I'm a big beggar with strong leg muscles...).
If I switch off, then pump the pedal until the servo effect is exhausted, then pump it to take up the excess travel, it goes hard, and then heavy pressure will not budge it any further down.
The second, non-servo, brake actuation certainly suggests air in the brake system, which bleeding should fix, but I'm rather puzzled by what happens when the brakes have servo assistance. Can anybody shed any light on this peculiar symptom?
The brakes work perfectly, and there are no dash warning lights on at all when the car is running. However, brake pedal travel is longer than I'm used to, and if I keep heavy pressure on the pedal after the car has stopped it will sink slowly and steadily to very near the floor with no increase in resistance. (I'm a big beggar with strong leg muscles...).
If I switch off, then pump the pedal until the servo effect is exhausted, then pump it to take up the excess travel, it goes hard, and then heavy pressure will not budge it any further down.
The second, non-servo, brake actuation certainly suggests air in the brake system, which bleeding should fix, but I'm rather puzzled by what happens when the brakes have servo assistance. Can anybody shed any light on this peculiar symptom?