Scientific and Production Company VMPAUTO

 

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Oil viscosity losses in the engine

Viscosity of engine oils and oil thickeners

 

 

Constantine Dubarev – KIA Cerato owner gives a piece of advice on how to eliminate brakes’ squeal. New pair of brake pads installed on KIA Cerato of 2006, used to squeak. Constantine applied brakes grease MC-1600 and after its application the squeal was eliminated.

“In August 2012 came the time to replace the front brake disks and brake pads on my KIA Cerato of 2006. Usually I am prone to spend considerably high amounts of money on repairs, especially when it comes to brake system. So I bought an original repair kit (brake pads and brake disks).

After installation and running of brake pads (100-700 km) I started to notice squealing sounds when braking. And if at the beginning the sound appeared periodically, in two weeks brake pads squeaked every time. Generally I realized that creaking and brake system performance have little to do with each other, but it was not a pleasant sound to hear.

I studied briefly the subject of brake pads squealing elimination, I chose to work with multipurpose caliper greases. I did not go with the use of special anti-squealing plates. They usually are specifically selected for the caliper and brake pads model and that usually means waiting for another order at the car parts shop, new queues, a waste of time generally speaking.

So, after application of a multipurpose brake grease on a back side of brake pads, those that do not interact with brake disks when braking – the squealing evaporated.

 

A pair of new brake pads lubricated with multipurpose caliper grease

The most interesting part is that the caliper grease came in handy practically in a week. When I was stopping near one of the cities crossroads in the driver's rear view mirror, I saw the smoke, which was coming, as I thought, from the rear wheel arch.

A few seconds later the smoke seeped into the cabin, and I felt the acrid, irritating for the eyes, nose and throat odor.

The car still moved forward, however during acceleration and braking and the car felt very sluggish, as if something prevented it from smooth moving. In addition, the gear (automatic transmission) switching was no longer smooth enough.

In the evening that day I came to my car mechanic about this problem. He diagnosed back caliper jamming.

In fact, brake piston stopped moving, because of guide pins jamming.

It happened because the caliper parts were not lubricated properly.

After application of copper paste the guide pin was scorched

Of course, the caliper had to be replaced. And this time the new one was wholly lubricated – guide pins and brake piston – to prevent corrosion and jamming in the future.”

 

EXPERT OPINION. REPLACE THE BRAKE PADS PROPERLY.

When you replace the pads it is very important to pay close attention to lubrication of all caliper parts: guide pins, non-working surface of brake pads, the brake piston and the anthers.

Caliper guide pin lubricated with synthetic based multipurpose grease

It can take a little bit more time than a regular procedure of brake pads replacing, but paying attention to every part will pay off in the future. Safety of driving on a long term basis depends on that.

Operational temperature of disk brakes in severe conditions can sometimes reach up to +500°С +600°С.

There is a wide range of lubrication materials used when brake pads are replaced, and operational life of caliper parts in many ways depend on a wise choice of them.

Random lubricants

- Aerosols are very convenient in application, but they are not compatible with rubber parts of caliper, and therefore, deformation and loss of integrity occur.

Anther increased in size 3 times and lost tightness after the contact with the applied graphite grease. Application of copper-bearing aerosol gives a similar effect.

- Traditional lithium greases or graphite greases are oil-based and therefore are not compatible with rubber anthers. These greases have a low temperature range, and quickly fade away. Such lubricants are easily identified by the operating temperature of 200°C.

- Copper greases do not always withstand high temperatures and burn out on the guide pins, causing corrosion.

- Specialized greases for different caliper joints do not imply multipurpose usage.

HOW TO CHOOSE THE GREASE FOR CALIPER

When you select a lubricant it is essential to pay attention to such key properties:
- High temperature range,
- No interaction with brake fluids,
- Synthetic base,
- Multipurpose use,
- Rubber friendly.

Now that we know the cause of the problem and how to fix it – it’s time to act! When you replace the pads, lubricate slide pins, back surfaces of brake pads and brake piston with a high quality multipurpose grease for calipers.