A grinding or squeaking when you brake is usually worn brake pads. If your tires are wet, the brakes might screech for a while, but then the noise disappears. Some brake pads have "squealers"—a piece of metal that rubs against the brake rotor once the pad material gets low. If you hear this noise while driving or if grinding accompanies the screeching, your brake pads may need replacing.

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Of course, these are just some of the noises your car might make and their possible causes. It's always best to consult a licensed professional mechanic to accurately diagnose and fix the problem. Happy driving!

While idling, you hear a rumbling noise. As you accelerate, the noise gets louder. You may have an exhaust leak at a gasket or in one of the exhaust components, such as the flex pipe or muffler. You may need to repair or replace the leaking component.

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Do you hear a flapping sound like a flat tire, but all the tires are properly inflated? It might be a broken fan belt. Replacing a fan belt is a standard fix and relatively inexpensive, so don't wait to get it repaired.

Using the wrong type of gasoline can cause a knocking or pinging sound in the engine. Using a low-grade gasoline when it requires high octane may cause damage to the spark plugs. As a result, the engine pistons will move erratically, and you could hear a knocking sound. This can easily be rectified by ensuring you use the right type of gasoline.

Produced by: The final products of the Hipparcos mission - the Hipparcos and Tycho Catalogues - were released in June 1997. The catalogues were constructed under the responsibility of large scientific teams collaborating with ESA. The Consortia Leaders were Dr Lennart Lindegren (Lund, Sweden: NDAC) and Professor Jean Kovalevsky (Grasse, France: FAST) together responsible for the Hipparcos Catalogue; Professor Erik Høg (Copenhagen, Denmark: TDAC) responsible for the Tycho Catalogue; and Dr Catherine Turon (Meudon, France: INCA) responsible for the Hipparcos Input Catalogue.

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Further descriptions of the catalogues may be found in: The Hipparcos Catalogue, Perryman, M.A.C. et al., 1997, A&A 323, p.L49-L52 Double star data in the Hipparcos Catalogue, Lindegren, L. et al., 1997, A&A 323, p.L53-L56 The Tycho Catalogue, Høg, E. et al., 1997, A&A 323, p.L57-L60 The Hipparcos mission: photometric data, van Leeuwen, F. et al., 1997, A&A 323, p.L61-L64

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These tips are provided for information and prevention purposes only. They are general in nature, and The Personal cannot be held liable for them. We recommend using caution and consulting an expert for comprehensive, tailored advice.

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If your car sounds like a loud laundry machine on high spin, pull over and check your tires. The problem could be loose wheel nuts (which means the wheel could fall off), or low tire pressure, which could cause a tire blowout. Jack up your car. then tighten your wheel nuts using the lug wrench. If the tire pressure is low, fill it to the proper weight. You might need to replace the tire if the sound continues.

A droning noise that gets louder as you accelerate may be coming from your tires—particularly if they're old or worn. It could also be a sign that you have "feathered" tires, meaning the treads are wearing unevenly. Your tires are an important safety feature, so get them checked.

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You’re used to the sounds your car makes. But what if you hear a strange new noise from your car? Is it safe to ignore that bang, clang, click or squeal? Delaying a visit to the mechanic could make the problem worse—and more expensive to repair.

Catalogue Access: Except for Tycho Epoch Photometry Annex B, the data is available in the Hipparcos and Tycho Legacy Archive via the ESASky Legacy Table Access Protocol (TAP) service (in the Topcat tool, select the option "Table Access Protocol (TAP) Query" in the VO menu and paste the TAP url http://esaskylegacy.esac.esa.int/esasky-legacy-sl-tap/tap in the "Select Service” pane). The Hipparcos and Tycho Catalogue data are also available from CDS, through relational database queries in VizieR, cross-identifications within SIMBAD, and data overlay in the Aladin sky atlas. Note that the Tycho Epoch Photometry Annex B is also available from CDS. This annex is archived offline, and is available for reasonable scientific queries. The Hipparcos Catalogue is also available from ESASky and from the Gaia Archive.

Does it sound like a bird is chirping when you start the engine? The problem could be a worn or cracked belt. Vehicles often have multiple belts including a separate one for the air conditioner. If this sound only happens when you turn on the A/C, the belt probably needs to be adjusted or replaced.

If you hear a hissing sound when you first pull into the driveway and shut off your vehicle, it could be a sign that something is leaking in your car engine. The hissing could be liquid falling on hot engine parts: engine oil, transmission fluid or coolant. Or, your radiator might be overheating.

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You hear a clicking or humming noise that gets louder and faster as you accelerate while turning the wheel in one direction. The noise disappears when you turn the other way. This could be a problem with your wheel bearings or a CV axle that's worn and leaking grease. Without grease, the components become dry and start making a clicking sound. Your mechanic might be able to top up the grease and replace the boot.

The following documents are an extract from Volume 1 giving some details of the main Hipparcos and Tycho catalogue fields: Guide to Hipparcos fields (pdf) and Guide to Tycho fields (pdf).

Sample Pages: On-line extracts from the Hipparcos and Tycho Catalogues illustrating the contents of the various volumes.

A continuous rattling sound from underneath the car means something is loose. Often, it's easy to spot what's causing the noise because the loose component is hanging down in plain sight. For example, a loose tailpipe or muffler can be easily tightened with a screwdriver.