Its extremely unusual to get air trapped in the ABS modulator. If you have a spongy pedal I would make sure that you have bled the brakes conventionally first and properly & checked everything else out first. You may get air in the ABS if when bleeding you do not top up the fluid and air gets in the system. If the car has been regularly serviced and brake fluid changed there is no reason air can get trapped.
If your sure air is trapped in the ABS, the first step would be a power bleed that has more chance of getting it out.
If you have a car with lots of miles, then you get the same affect when all the seals get spongy. I've had dozens of cars and never had air trapped in the ABS.
Change brake fluid regularly and all the components will outlast the car! Its the most unserviced item on lots of cars.
|