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Repair and maintenance information for MG vehicles

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MG Repair Information

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Brakes Too Hard or Too Spongy

A spongy brake pedal may be caused by a damaged hydraulic cylinder, excess air in the hydraulic system, and/or distorted lining of the brake shoes. To fix these, you can: (a) bleed the system to remove air pockets; (b) repair leaks in the brake lines and cylinder; and/or (c) replace your brake pads or shoes, or have their friction material relined.

When the brake pedal becomes hard to push, it might be an indication that the brake pads' or shoes' friction material has gone too smooth or has been coated with oil. It may also mean that the caliper piston or wheel cylinder is stuck. Should any of these be the case, you have to replace the affected piston, cylinder, or brake shoe/pad.

Lack of Compression in Engine Cylinder

This engine trouble may be caused by excessively worn valve stems or guides, or by gaps between the valve seat and the valve head. What you can do is replace your valve guides and valve stems and/or have the valve seats recut.

Loss of compression can also be caused by a faulty head gasket, the gasket placed between the engine block and the valve cover. After some time, it may crack or become distorted under extreme engine conditions, allowing for coolant and oil leaks and compression loss. If this is the case, replace the gasket and/or reface the mating surfaces.

Worn pistons, piston rings, and cylinder bores also cause lack of compression. Replace warped and broken rings. If the rings are in good condition, the problem may be with the piston head and cylinder bore. You can replace the pistons and have the cylinder resurfaced or rebored in a machine shop.

Flooding or Fuel System Gets Choked With Fuel

Replace the needle valve and seat. Flooding may be caused by damage or misalignment in these two components of the float system. If the needle isn't properly seated because of dirt or warping, fuel would be continuously pumped into the fuel bowl, eventually flooding the manifold.

Adjust the system's float level. You can do this by adjusting the metal arm that supports the float. Or, you can replace the float altogether. When choosing a replacement, make sure that you get the right float drop and that the float won't rub against the float chamber too much.

Replace or repair the fuel pump. A damaged or worn fuel pump also causes flooding in that it can create excessive pressure in the fuel system.

Clean the carburetor. Accumulated debris and dirt can clog passages and lower the fuel pressure, making the float system lose control over the amount of fuel that goes into the manifold. When cleaning the carburetor, use towels or rags to cover the parts that shouldn't be sprayed with the carburetor cleaner. For stubborn grime, soak the component in the cleanser overnight. For hard-to-reach areas and screw threads, you can use toothpicks and small wire brushes for cleaning. Here is more information on replacing the carburetor.

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