Auto Service Professional

APR 2018

Magazine for the auto service professional

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40 | ASP April 2018 Technical Avoiding brake service comebacks A few common fixes to create satisfied customers By Mike Mavrigian B rake system service has its own set of issues, starting with "rust never sleeps." Especially in areas of the country that expe- rience winter conditions, where ice-melting chemicals are applied to the roadways, closely inspect all brake lines at every opportunity (whenever a vehicle is on a lift). Some of today's salt/brine road coatings are extremely corrosive and tend to stick to undercarriages, and are difficult to wash off. Any brake line that is even marginally suspect should be replaced. Explain to the customer the need for such replacement and the necessity for catching the problem before it gets worse. A rotted brake line is compromised in terms of tubing wall thickness and resistance to brake system pressure. A compromised brake line obviously can result in a leakage that will, sooner or later, result in a no-brake condition. Invest in a high quality brake line flaring tool. Inexpensive flaring tools can prove finicky, often resulting in off-center flares that will not seal correctly. Also, always use a proper line wrench when servicing brake line fittings/connections. A line wrench captures more surface area along the fitting hex, eliminating the potential for damaging/ rounding-off the hex. Leaks with new lines If you happen to deal with stainless steel brake lines, it's not uncommon to experience a small initial fluid leak when a new stainless line is installed. If this occurs, loosen the connection and re-tighten. is often corrects the issue. Stainless lines/flares are relatively hard and sometimes require repeated cycles of loosening and tightening in order to obtain a leak-proof seating at the flare. Brake calipers that feature a banjo bolt to secure the flexible brake hose to the caliper require a crush washer on both sides of the bolt (between the bolt head and caliper and between the brake hose fitting and bolt head). Never re-use crush washers. Always install new crush washers. ese soft-metal compressible washers are commonly made of copper or aluminum and are intended as one-time-use washers. As with stainless lines, new crush washers some- times require a loosening and re-tightening in order to establish a fluid seal. A number of potential problems can easily result in operational issues and/ or customer complaints following brake system service. Here we'll discuss a few points that will help to avoid these con- cerns and help give your customers a "sweet" ride.

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