I own a stock 1995 C280 with 72,000 miles. I'm sure its due for a check up, but the brake pedals frequently feels spongy and won't pop back up realy quick after depressing the pedal. Also, the brakes don't fell really grippy (like their really clamping the calipers) like they slow the car down. My view may be a bit skewed because I drove my parents 98 BMW 528i and it had awesome tight brakes. Are the brakes on the C-Class always spongy? Is there something that needs to be done? Thanks.